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Old September 30, 2013, 07:54 PM   #1
4runnerman
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Join Date: January 16, 2010
Location: Minnsota
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best guess

Hey all looking for best guess at muzzle velocity

6MMBR
30 inch barrel
1/8 twist
107 Serria Match
28.4 gn Varget
CCI BR-4 primers
COL 2.40

Any Help would be great
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Old September 30, 2013, 09:04 PM   #2
jepp2
Senior Member
 
Join Date: December 24, 2008
Location: Loveland, CO
Posts: 1,340
Using all standard values in QuickLoad:

Code:
-------------------------------------------------------------------------------
 WARNING: Table produced by not verified Ballistics Calculations! Check results
always against loading data of current reloading manuals! Input data and results
may be invalid or wrong! The use of this data for loading ammunition can cause,
directly or indirectly, serious injury to personnel and material. No responsibi-
  lity is implied and THE USER MUST ASSUME THE ENTIRE RISK OF USING THE DATA.
               QuickLOAD© V.3.5 Interior BallisticsV.3.5 #531788
            © Copyright 1987-2009 - H.Broemel, Babenhausen, Germany
-------------------------------------------------------------------------------
 Case capacity and propellant properties may vary considerably from lot to lot!

**** Input data:                         Date: 30-Sep-2013     Time: 19:57:27
Cartridge................. = 6 mm B.R. Rem
Projectile type........... = .243, 107, Sierra HPBT MK 1570 with boattail

Max.avg.pressure(Piezo CIP)= 58740 psi   Shot start / init pressure = 3626 psi
Projectile weight      (gr)= 107         Groove caliber         (in)= 0.242
Length of cartridge    (in)= 2.400       Length of case         (in)= 1.550
Case capacity(Grains Water)= 37.80       Length of projectile   (in)= 1.260
Length of barrel       (in)= 30.000
**** Values calculated:
Seating depth          (in)= 0.609       Volume displaced   (gn H2O)= 6.42
Comb.chamber volume(gn H2O)= 31.37       Projectile travel      (in)= 29.059
**** Input data:
Propellant type........... = Hodgdon VARGET
Charge weight..........(gr)= 28.4        Load density......(g/cu.cm)= 0.903
Heat of Explosion  (cal/lb)= 438779      Ratio of spec. heats cp/cv = 1.223
Solid density    (gr/cu.in)= 404.6       Weighting factor...........= 0.5
Burning rate factor Ba(1/s)= 0.615       Pro-/degressivity factor a = 0.113
Burning limit ......... z1 = 0.4         Combust.Chamber Vb(ft³)= 7.192468E-5
Factor.................. b = 1.367       X-S.Area of Bore A(ft²)= 3.177604E-4
Bulk density     (gr/cu.in)= 225.1       Projectile mass mp (lb)= 1.528439E-2
Loading ratio           (%)= 101.5       Projectile travel x(ft)= 2.421621E+0

**** Results calculated:
Maximum pressure ........ = 57459 psi    Way of projectile at Pmax = 1.27 in
Muzzle velocity  ......Ve = 2829 fps     Muzzle pressure .......Pe = 5669 psi
Project. energy at muzzle = 1901 ft.lbs  Fraction of powder burnt  = 99.7  %
Projectile travel time from 10% Pmax to muzzle = 1.37 ms

WARNING: Near Maximum Average Pressure - tolerances can cause dangerous pressures !
Real maximum of pressure inside barrel.
End of combustion after the projectile passes muzzle.

                 Table of progress of computed firing process:

NR.:          x(in)         z (%)         v (fps)       p (psi)       t (ms)
-------------------------------------------------------------------------------
  0             0.000         1.33           0.0           3626        0.0000
  1             0.000         1.37           0.7           3724        0.0015
  2             0.000         1.44           2.1           3921        0.0046
  3             0.000         1.50           3.2           4068        0.0086
  4             0.000         1.59           5.0           4313        0.0136
  5             0.001         1.70           7.3           4631        0.0193
  6             0.002         1.84          10.0           4996        0.0258
  7             0.003         2.00          13.2           5433        0.0331
  8             0.004         2.20          17.0           5952        0.0410
  9             0.006         2.43          21.6           6564        0.0495
 10             0.009         2.70          26.8           7266        0.0585
 11             0.012         3.02          33.1           8093        0.0680
 12             0.016         3.38          40.2           9028        0.0778
 13             0.022         3.80          48.5          10101        0.0880
 14             0.028         4.29          58.0          11318        0.0984
 15             0.036         4.84          68.8          12676        0.1090
 16             0.046         5.47          81.1          14192        0.1197
 17             0.058         6.18          95.0          15866        0.1306
 18             0.071         6.97         110.7          17697        0.1415
 19             0.087         7.87         128.2          19684        0.1525
 20             0.105         8.86         147.7          21819        0.1635
 21             0.126         9.97         169.3          24095        0.1746
 22             0.150        11.18         193.1          26486        0.1856
 23             0.177        12.52         219.1          28978        0.1966
 24             0.208        13.97         247.5          31541        0.2076
 25             0.243        15.55         278.3          34149        0.2185
 26             0.281        17.25         311.4          36763        0.2295
 27             0.324        19.08         347.0          39355        0.2404
 28             0.372        21.03         385.0          41883        0.2514
 29             0.426        23.10         425.2          44314        0.2623
 30             0.484        25.30         467.8          46618        0.2732
 31             0.549        27.61         512.5          48761        0.2842
 32             0.620        30.03         559.3          50713        0.2952
 33             0.697        32.55         608.1          52454        0.3062
 34             0.781        35.17         658.7          53966        0.3173
 35             0.873        37.88         710.9          55235        0.3285
 36             0.973        40.67         764.6          56260        0.3398
 37             1.081        43.54         819.7          57033        0.3511
 38             1.091        43.79         824.7          57089        0.3522
 39             1.208        46.57         878.6          57414        0.3636
 40             1.238        47.25         892.1          57446        0.3665
 41             1.253        47.59         898.8          57455        0.3679
 42             1.261        47.76         902.2          57457        0.3686
 43             1.269        47.93         905.6          57459        0.3693
 44             1.273        48.02         907.2          57459        0.3697
 45             1.277        48.10         908.9          57459        0.3700
 46             1.404        50.76         962.9          57312        0.3814
 47             1.540        53.36        1016.8          56899        0.3928
 48             1.684        55.88        1070.8          56249        0.4043
 49             1.837        58.34        1124.7          55385        0.4159
 50             2.001        60.72        1178.6          54332        0.4278
 51             2.175        63.04        1232.6          53111        0.4398
 52             2.362        65.28        1286.5          51745        0.4522
 53             2.561        67.45        1340.4          50252        0.4648
 54             2.775        69.56        1394.4          48652        0.4779
 55             3.006        71.59        1448.3          46960        0.4914
 56             3.253        73.55        1502.3          45195        0.5054
 57             3.520        75.44        1556.2          43370        0.5199
 58             3.808        77.27        1610.1          41501        0.5351
 59             4.120        79.02        1664.1          39599        0.5509
 60             4.457        80.70        1718.0          37678        0.5676
 61             4.823        82.31        1772.0          35748        0.5850
 62             5.222        83.85        1825.9          33821        0.6035
 63             5.656        85.32        1879.8          31906        0.6230
 64             6.130        86.72        1933.8          30011        0.6437
 65             6.648        88.05        1987.7          28144        0.6658
 66             7.217        89.31        2041.7          26313        0.6893
 67             7.842        90.50        2095.6          24525        0.7145
 68             8.531        91.62        2149.5          22785        0.7415
 69             9.293        92.67        2203.5          21098        0.7707
 70            10.137        93.65        2257.4          19469        0.8022
 71            11.074        94.56        2311.4          17902        0.8364
 72            12.120        95.40        2365.3          16399        0.8737
 73            13.289        96.17        2419.2          14965        0.9144
 74            14.601        96.87        2473.2          13600        0.9591
 75            16.080        97.49        2527.1          12306        1.0084
 76            17.752        98.05        2581.1          11086        1.0630
 77            19.651        98.54        2635.0           9938        1.1236
 78            21.818        98.96        2688.9           8864        1.1915
 79            24.302        99.30        2742.9           7863        1.2677
 80            27.165        99.58        2796.8           6935        1.3538
 81            28.761        99.69        2823.8           6498        1.4012
 82            28.969        99.70        2827.2           6444        1.4073
 83            29.022        99.71        2828.0           6431        1.4088
 84            29.048        99.71        2828.4           6424        1.4096
 85            29.054        99.71        2828.5           6423        1.4098
 86            29.058        99.71        2828.6           6422        1.4099
 87            29.059        99.71        2828.6           6421        1.4099
 88            29.060        99.71        2828.6           6421        1.4100

Muzzle exit
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Old September 30, 2013, 09:21 PM   #3
4runnerman
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Join Date: January 16, 2010
Location: Minnsota
Posts: 2,800
Thanks Jepp2. I just worked this load up last weekend and forgot the chroney at home. I have a match Saturday morning and would not have time to get back out to range. Very Very much appreciate the help
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Old October 1, 2013, 09:48 PM   #4
jepp2
Senior Member
 
Join Date: December 24, 2008
Location: Loveland, CO
Posts: 1,340
Per your request, rerun with 28.6 gr. It calculates basically at the max pressure.

Code:
-------------------------------------------------------------------------------
 WARNING: Table produced by not verified Ballistics Calculations! Check results
always against loading data of current reloading manuals! Input data and results
may be invalid or wrong! The use of this data for loading ammunition can cause,
directly or indirectly, serious injury to personnel and material. No responsibi-
  lity is implied and THE USER MUST ASSUME THE ENTIRE RISK OF USING THE DATA.
               QuickLOAD© V.3.5 Interior BallisticsV.3.5 #531788
            © Copyright 1987-2009 - H.Broemel, Babenhausen, Germany
-------------------------------------------------------------------------------
 Case capacity and propellant properties may vary considerably from lot to lot!

**** Input data:                         Date: 1-Oct-2013     Time: 20:41:14
Cartridge................. = 6 mm B.R. Rem
Projectile type........... = .243, 107, Sierra HPBT MK 1570 with boattail

Max.avg.pressure(Piezo CIP)= 58740 psi   Shot start / init pressure = 3626 psi
Projectile weight      (gr)= 107         Groove caliber         (in)= 0.242
Length of cartridge    (in)= 2.400       Length of case         (in)= 1.550
Case capacity(Grains Water)= 37.80       Length of projectile   (in)= 1.260
Length of barrel       (in)= 30.000
**** Values calculated:
Seating depth          (in)= 0.609       Volume displaced   (gn H2O)= 6.42
Comb.chamber volume(gn H2O)= 31.37       Projectile travel      (in)= 29.059
**** Input data:
Propellant type........... = Hodgdon VARGET
Charge weight..........(gr)= 28.6        Load density......(g/cu.cm)= 0.910
Heat of Explosion  (cal/lb)= 438779      Ratio of spec. heats cp/cv = 1.223
Solid density    (gr/cu.in)= 404.6       Weighting factor...........= 0.5
Burning rate factor Ba(1/s)= 0.615       Pro-/degressivity factor a = 0.113
Burning limit ......... z1 = 0.4         Combust.Chamber Vb(ft³)= 7.192468E-5
Factor.................. b = 1.367       X-S.Area of Bore A(ft²)= 3.17761E-4
Bulk density     (gr/cu.in)= 225.1       Projectile mass mp (lb)= 1.528439E-2
Loading ratio           (%)= 102.2       Projectile travel x(ft)= 2.421621E+0

**** Results calculated:
Maximum pressure ........ = 58708 psi    Way of projectile at Pmax = 1.26 in
Muzzle velocity  ......Ve = 2846 fps     Muzzle pressure .......Pe = 5691 psi
Project. energy at muzzle = 1924 ft.lbs  Fraction of powder burnt  = 99.7  %
Projectile travel time from 10% Pmax to muzzle = 1.36 ms

WARNING: Near Maximum Average Pressure - tolerances can cause dangerous pressures !
Real maximum of pressure inside barrel.
End of combustion after the projectile passes muzzle.

                 Table of progress of computed firing process:

NR.:          x(in)         z (%)         v (fps)       p (psi)       t (ms)
-------------------------------------------------------------------------------
  0             0.000         1.31           0.0           3626        0.0000
  1             0.000         1.35           0.7           3726        0.0015
  2             0.000         1.42           2.1           3926        0.0046
  3             0.000         1.47           3.2           4075        0.0086
  4             0.000         1.56           5.0           4324        0.0136
  5             0.001         1.68           7.3           4647        0.0193
  6             0.002         1.82          10.0           5019        0.0258
  7             0.003         1.98          13.2           5462        0.0331
  8             0.004         2.18          17.0           5990        0.0410
  9             0.006         2.41          21.6           6612        0.0495
 10             0.009         2.68          26.9           7345        0.0585
 11             0.012         3.00          33.2           8186        0.0680
 12             0.016         3.37          40.4           9154        0.0778
 13             0.022         3.79          48.7          10251        0.0879
 14             0.028         4.28          58.3          11493        0.0982
 15             0.036         4.84          69.2          12890        0.1087
 16             0.046         5.48          81.7          14448        0.1194
 17             0.058         6.19          95.7          16164        0.1302
 18             0.071         7.00         111.5          18046        0.1411
 19             0.087         7.91         129.3          20090        0.1520
 20             0.105         8.92         149.0          22289        0.1629
 21             0.126        10.03         170.8          24622        0.1738
 22             0.150        11.26         194.9          27081        0.1847
 23             0.177        12.62         221.3          29644        0.1956
 24             0.208        14.09         250.0          32276        0.2065
 25             0.243        15.69         281.2          34954        0.2173
 26             0.281        17.41         314.7          37638        0.2282
 27             0.324        19.26         350.7          40296        0.2390
 28             0.372        21.24         389.1          42887        0.2498
 29             0.426        23.34         429.9          45383        0.2606
 30             0.484        25.56         473.0          47739        0.2715
 31             0.549        27.90         518.2          49926        0.2823
 32             0.620        30.35         565.6          51922        0.2932
 33             0.697        32.91         614.9          53698        0.3041
 34             0.781        35.56         666.0          55236        0.3151
 35             0.873        38.30         718.9          56526        0.3261
 36             0.973        41.13         773.2          57561        0.3373
 37             1.072        43.79         824.4          58286        0.3476
 38             1.186        46.57         878.3          58646        0.3588
 39             1.216        47.25         891.8          58685        0.3616
 40             1.246        47.93         905.2          58705        0.3644
 41             1.254        48.10         908.6          58707        0.3651
 42             1.257        48.18         910.3          58708        0.3654
 43             1.261        48.27         912.0          58708        0.3658
 44             1.265        48.35         913.7          58708        0.3661
 45             1.391        51.01         967.6          58559        0.3773
 46             1.524        53.60        1021.4          58142        0.3884
 47             1.665        56.12        1075.3          57484        0.3997
 48             1.816        58.57        1129.2          56609        0.4111
 49             1.976        60.94        1183.1          55543        0.4226
 50             2.147        63.25        1237.0          54307        0.4344
 51             2.330        65.49        1290.9          52922        0.4465
 52             2.526        67.65        1344.8          51408        0.4588
 53             2.736        69.75        1398.7          49785        0.4716
 54             2.962        71.78        1452.6          48068        0.4848
 55             3.204        73.73        1506.5          46276        0.4984
 56             3.465        75.62        1560.4          44423        0.5126
 57             3.747        77.43        1614.3          42523        0.5274
 58             4.052        79.18        1668.2          40590        0.5429
 59             4.382        80.85        1722.1          38636        0.5591
 60             4.739        82.46        1776.0          36673        0.5762
 61             5.128        83.99        1829.9          34711        0.5941
 62             5.552        85.46        1883.8          32760        0.6131
 63             6.014        86.85        1937.7          30829        0.6333
 64             6.520        88.18        1991.6          28926        0.6548
 65             7.074        89.43        2045.5          27058        0.6776
 66             7.683        90.61        2099.3          25233        0.7021
 67             8.353        91.73        2153.2          23456        0.7284
 68             9.094        92.77        2207.1          21732        0.7567
 69             9.914        93.74        2261.0          20067        0.7873
 70            10.825        94.64        2314.9          18463        0.8205
 71            11.840        95.48        2368.8          16925        0.8566
 72            12.974        96.24        2422.7          15455        0.8960
 73            14.245        96.93        2476.6          14056        0.9393
 74            15.677        97.55        2530.5          12729        0.9869
 75            17.295        98.10        2584.4          11476        1.0396
 76            19.131        98.58        2638.3          10297        1.0982
 77            21.223        98.99        2692.2           9192        1.1637
 78            23.620        99.33        2746.1           8162        1.2371
 79            26.379        99.60        2800.0           7206        1.3200
 80            27.917        99.71        2826.9           6755        1.3656
 81            28.730        99.76        2840.4           6537        1.3895
 82            28.938        99.77        2843.8           6483        1.3956
 83            29.043        99.78        2845.5           6456        1.3987
 84            29.056        99.78        2845.7           6452        1.3990
 85            29.059        99.78        2845.7           6452        1.3991
 86            29.060        99.78        2845.7           6452        1.3992

Muzzle exit
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