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 November 26, 2011, 12:50 AM #1 Bill Daniel Senior Member   Join Date: February 10, 2000 Location: Bowling Green, KY. Posts: 417 Calculating Nodes Just back from testing some loads with 175 grain SMK's and R15 power. My best group was with 43.6 grains at 0.75 inches for a 5 shot group at 100 yards. 43.4 yielded 1.19 inches/ 43.8 yielded 1.01 inches/ 44 yielded 1.15 inches and 44.2 yielded 1.36 inches. This is from a Savage FCP in 308 at 0.01 inch from the lands. Should I try 43.5 and 43.7 to fine tune or does 0.1 grain change make that much difference in a 308? My goal is a 1000 yard round. My plan is to find my most accurate load and then chronograf to see if the muzzle velocity will keep the 175 SMK supersonic at 1000 yards. Once there I will work out the distance in stages. Any advice is appreciated. Thanks __________________ Prosecute criminals to the fullest extent of the law and their weapons will become harmless. "Let us speak courteously, deal fairly, and keep ourselves armed and ready." Theodore Roosevelt 1903
 November 26, 2011, 09:05 AM #2 mehavey Senior Member   Join Date: June 17, 2010 Location: Virginia Posts: 4,206 1/10 grain will make little (if any) difference, and is the usual margin of error in even the most consistent of reloading processes. Some suggest 2/10ths as the least rung on the ladder. I have settled on 3/10th for the most part. As to velocities/pressures for your 175SMK/43.6gr Varget/2.800 OAL: QL tells me you are running 56,500psi (in a 60,000psi max cartridge) for 2,640fps in a 24" barrel. The usual match (M118) standard is 2,550, so you're G2G for 1,000 yards. Incidentally, ±1/10th grain yield ± 6fps ..... totally in the statistical noise; and seating out another 50 thousands (or wherever the lands might be in your rifle) only loses you 20fps.
 November 26, 2011, 01:02 PM #3 black mamba Senior Member   Join Date: September 13, 2011 Location: O'Fallon, MO Posts: 636 Seating closer to the lands (farther out) in a bottleneck cartridge will INCREASE pressure and velocity, not lose it, unless you have a 1/4" or more of freebore.
 November 26, 2011, 02:25 PM #4 edward5759 Senior Member   Join Date: September 15, 2009 Location: Phoenix, AZ. 30 miles from water, two feet from Hell. Posts: 355 With the 175 grain bullet I have found most loads will be sonic out to about 1000 yards after that they drop off fast. I got key holes at 1200 on paper. Computer programs are just that, programs they will give you an idea but that's about it. Shooting is the best way to tell. Shooting here in Arizona I have had good luck with BLC powder even when it's 115 degrees outside. My best was with 172 B.T. Government pull downs. I do shoot with a + 20 mount for the scope to give enough clicks for the distance. I have had no luck shooting longer distance with the 308. but I have had a little with the 30-06 "A little better" Good luck Edward5759 __________________ Failure is part of success! This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future!" -Adolf Hitler,1935"
November 26, 2011, 04:25 PM   #5
mehavey
Senior Member

Join Date: June 17, 2010
Location: Virginia
Posts: 4,206
Quote:
 Seating closer to the lands (farther out) in a bottleneck cartridge will INCREASE pressure and velocity,
I have not found that to be the case experimentally. Pressure may initially peak slightly higher,
but it's the total area under the 24" curve that finally matters. I generally give it a wash.

 November 26, 2011, 05:28 PM #6 Bill Daniel Senior Member   Join Date: February 10, 2000 Location: Bowling Green, KY. Posts: 417 Calculating Nodes Thanks to all for your replies. Thanks, mehavey, for checking the ballistics on your Quick Load calculator for me. edward 5759 new glass and mounts will be in the works as I increase my ranges. __________________ Prosecute criminals to the fullest extent of the law and their weapons will become harmless. "Let us speak courteously, deal fairly, and keep ourselves armed and ready." Theodore Roosevelt 1903
November 28, 2011, 09:23 AM   #7
mehavey
Senior Member

Join Date: June 17, 2010
Location: Virginia
Posts: 4,206
Quote:
Quote:
 Seating closer to the lands (farther out) in a bottleneck cartridge will INCREASE pressure and velocity,
I have not found that to be the case experimentally. Pressure may initially peak slightly higher,
but it's the total area under the 24" curve that finally matters. I generally give it a wash.
Supplying mere corroborative detail to add verisimilitude to an otherwise bald and unconvincing narrative... ( )*
here is the data/experience I had mentioned earlier.

http://thefiringline.com/forums/show...58&postcount=1

Last edited by mehavey; November 28, 2011 at 09:39 AM.

 November 28, 2011, 09:52 AM #8 Brian Pfleuger Staff   Join Date: June 25, 2008 Location: Central, Southern NY, USA Posts: 18,948 UncleNick has several times posted a graph of seating depth versus pressure in 30-06.... Here is one such example: Were I to hazard a guess, I would say that pressure and velocity BOTH increase as the bullet is seated closer to the lands but at some point, probably very close to the lands, the force of engraving the rifling without the bullet getting a headstart "uses up" the extra pressure and velocity no longer increases. That theory seems more or less in line with Mehavey's graph. Note that there's not a whole lot of change in pressure based on UncleNicks chart. A full quarter inch change in distance changes the pressure only 6,000 psi, about 9.6%. Along more common distance (say 0 to .10), the change is only 2,500 pounds. It would be very interesting to see a velocity graph overlay of that pressure graph. __________________ Still happily answering to the call-sign Peetza. --- The problem, as you so eloquently put it, is choice. -The Architect ----- He is no fool who gives what he can not keep to gain what he can not lose. -Jim Eliott, paraphrasing Philip Henry.
 November 28, 2011, 10:15 AM #9 frank_1947 Member   Join Date: August 9, 2008 Location: MO Posts: 76 Bill Save your self alot of time, if your going to shoot 1000 yards load to max of what ever book your useing best is go to manufacurer website and see what they tested bullet placement at lands will be what your looking far, all of the data books out there have been tasted if your gun is in good shape it should be no problem the worst that could happen is bolt may be harder at max to open then back off about.5 gr I shoot all competitions and most folks go for it all to max and then some. I have loaded for many 308 savage savage uses the same reamer on all their actions and same action quality no fear with savage I use Varget , i use Hogdon data from web and go max on any bullet hogdon shows that max is compressing powder not a problem bolt a little sticky on the palma gun back it off .5 it goes good. With any savage out of box right load good rest shouls shoot 1/2 inch at 100 and a constant 1/2 moa out to 200 from there on its the shooter. __________________ Frank NRA Certified Rifle Inst.
 November 28, 2011, 10:42 AM #10 Brian Pfleuger Staff   Join Date: June 25, 2008 Location: Central, Southern NY, USA Posts: 18,948 I know you did not just tell an inexperienced reloader to load some max charges and back off half a grain if the bolt sticks! Surely, you mean to work up those loads from the suggested starting load? Surely, by "worst that could happen", you meant "as you work up the loads" not "slap in that max load and all you might get is a sticky bolt".... right? __________________ Still happily answering to the call-sign Peetza. --- The problem, as you so eloquently put it, is choice. -The Architect ----- He is no fool who gives what he can not keep to gain what he can not lose. -Jim Eliott, paraphrasing Philip Henry.
 November 28, 2011, 05:15 PM #12 mehavey Senior Member   Join Date: June 17, 2010 Location: Virginia Posts: 4,206
 November 28, 2011, 10:48 PM #13 highvel Senior Member   Join Date: January 21, 2010 Location: Powhatan VA Posts: 633 Shocking turn of events dear Watson __________________ Do not argue with an idiot. He will drag you down to his level and beat you with experience.--Mark Twain "I have opinions of my own 'strong opinions' but I don't always agree with them."--George Bush
 November 28, 2011, 11:28 PM #14 Bill Daniel Senior Member   Join Date: February 10, 2000 Location: Bowling Green, KY. Posts: 417 Calculating Nodes frank_1947, Thanks for your suggestions but I noticed that my groups began getting larger the further I got from my 43.6 load so I would figure it would be worse at an over max load. Any thoughts? __________________ Prosecute criminals to the fullest extent of the law and their weapons will become harmless. "Let us speak courteously, deal fairly, and keep ourselves armed and ready." Theodore Roosevelt 1903
 November 30, 2011, 10:07 AM #17 frank_1947 Member   Join Date: August 9, 2008 Location: MO Posts: 76 Causious is good, you will need all you can get to hit at 1000 keep in mind Palma shooters use only a 155gr bullet for 1000 yard competition and F class shoots 1000 also, I can tell you this the Military uses a 175gr for some long range kills but they are running at 2700 fps + none of the books I have show data for that but Hogdon shows 2690 fps with 45 grs Varget, also a Mil Spec 308 that is 7.62x51 has a really long throat I have a Mil Spec gun and you can just touch the lands with a 175 and have enuff brass to hold the bullet you can not touch with any other lighter bullet , so long gives greater case capacity in a normal out of box gun that amount of powder is being compressed so you have more pressure you can reach 1000 no problem with any bullet, but how effectively? The gun I have is not a catalog gun and only one distributor carries it, it is a Rem 700 R4 Mil Spec SS I have won 1st and 2nd place with it this year, you can find then on the internet \$1000 plus under \$1000 is good. Sounds like you may be really getting into long range so keep in mind with your Savage action down the road you can have a barrel made just for 1000 yards + You would take a 175GR bullet set it in your case just so the brass grabs good maybe 1/4 inch then y6ou send that round no powder or primer to Shilen ask for no freebore a .330 neck 1/10 twist R4 or R5 not sure if they have R5 someone does just cant remember , Krieger will do the same but you save money with shilen because you can set barrel up your self with a few tools and a GO gage, I am thinking of doing this now but with a 155gr bullet. Good luck Frank __________________ Frank NRA Certified Rifle Inst.

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