I load low power bottle neck rounds using pistol powder a lot.
I can run you some Quickload data, but you left out all of the needed details.
Accuracy of calculated velocity is much better with:
- Bullet weight & brand if common, weight and length if not common
- AOL (with info above to get seating depth)
- Barrel length
I went ahead and ran a couple of powders (faster is better for this type of loading), a 55 gr Speer a random AOL & 16" barrel
Code:
Cartridge : .223 Rem. (SAAMI)
Bullet : .224, 55, Speer SP 1047
Useable Case Capaci: 26.819 grain H2O = 1.741 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 16.0 inch = 406.4 mm
Powder : Hodgdon HP38
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-30.0 20 4.20 1417 245 13128 2173 100.0 1.559
-26.7 21 4.40 1456 259 14067 2264 100.0 1.498
-23.3 22 4.60 1493 272 15023 2355 100.0 1.446
-20.0 23 4.80 1529 285 15998 2446 100.0 1.399
-16.7 24 5.00 1564 299 16992 2537 100.0 1.357
-13.3 25 5.20 1598 312 18005 2627 100.0 1.319
Cartridge : .223 Rem. (SAAMI)
Bullet : .224, 55, Speer SP 1047
Useable Case Capaci: 26.819 grain H2O = 1.741 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 16.0 inch = 406.4 mm
Powder : Alliant POWER PISTOL
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-12.0 22 4.40 1380 232 9482 2963 98.2 1.708
-08.0 23 4.60 1428 249 10144 3095 98.8 1.646
-04.0 24 4.80 1475 266 10829 3222 99.3 1.590
+00.0 25 5.00 1520 282 11535 3344 99.7 1.539
+04.0 27 5.20 1564 299 12263 3461 99.9 1.492
+08.0 28 5.40 1607 315 13014 3573 100.0 1.449
Now if you are talking 22" barrel the HP 38 numbers are
Code:
Cartridge : .223 Rem. (SAAMI)
Bullet : .224, 55, Speer SP 1047
Useable Case Capaci: 26.819 grain H2O = 1.741 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon HP38
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-33.3 19 4.00 1474 265 12206 1436 100.0 1.979
-30.0 20 4.20 1515 280 13128 1499 100.0 1.899
-26.7 21 4.40 1554 295 14067 1561 100.0 1.830
-23.3 22 4.60 1593 310 15023 1624 100.0 1.769
-20.0 23 4.80 1630 325 15998 1686 100.0 1.715
-16.7 24 5.00 1667 339 16992 1748 100.0 1.666