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#1 |
Senior Member
Join Date: July 25, 2010
Posts: 364
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1:10 vs 1:12 .308 Which is better all around(er)
Which twist rate is a better all around jack of all trades?
Keeping bullet weight ranges between 147 grains and 175 grains. Looking at a new Remy 700 and trying to choose between the varmint 26 incher in 1:12 and the AAC 20 incher in 1:10. |
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#2 |
Senior Member
Join Date: June 16, 2008
Location: Wyoming
Posts: 11,060
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1:10.
Faster twist will shoot lighter bullets but slower twist wont shoot heavy bullets. |
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#3 |
Junior Member
Join Date: April 17, 2011
Location: Jacksonville,AR72076
Posts: 4
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twist rate
I agree 1:10 frm gnbrown aspiring gunsmith!
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#4 |
Senior Member
Join Date: May 12, 2005
Location: Georgia, USA
Posts: 3,343
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1:10 ROT
Yep, all of my 7.62/.308 barrels have a 1:10 ROT...
I shoot everything from 147 grain NATO right up to 180 grain subsonic 7.62 x 51 though a suppressor with excellent results.
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#5 |
Senior Member
Join Date: June 11, 2007
Posts: 2,164
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I think you have to make a choice as to which rifle you want to buy and you get whatever that rifle has vs which is the best twist.
Remington puts 1/10 twist on their short barrel 308 rifles and the 308 Varmint rifle 26" long barrel has 1/12 and their 308 tactical has 1/11.25r barrel. The short barrel your looking at is suppressor ready. My gunsmith is a dealer for LMT rifle and his demo rifle is the 308 short barrel 1/11.25r twist and you think Rem would of used their 1/11.25r twist on that rifle and maybe it's pricing. I'm not a fan of 1/10 twist 30 cal barrels so I'd vote for 1/12 twist barrel. |
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#6 |
Senior Member
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,923
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For the 147-175gr bullet weights a 1-10 twist would be my choice.
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#7 |
Senior Member
Join Date: August 5, 2010
Posts: 212
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I thought .308 wasn't that senstitive and this only came up if one wanted to shoot sub-sonic rounds.
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#8 |
Member
Join Date: December 10, 2011
Location: Illinois
Posts: 32
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Just go with 1/10
Heavyer bullets move less in the wind, and a faster twist stableizes heavyer bullets better. To get the most out of this round a 1/10 twist is probably the best to go with.
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#9 |
Senior Member
Join Date: November 22, 1999
Location: Green Country, OK
Posts: 783
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I think I'll just stick with my 12 twist in .308 for up to 175 gr., especially if the bbl length is shorter. If I am shooting heavier bullets I'll go with a 10 twist in '06 or 300 Win Mag.
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#10 |
Senior Member
Join Date: October 18, 2011
Posts: 1,246
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I had an AI 1:12 would not stabilize for 800yds the 175 and 178 were flying all over the place
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#11 |
Senior Member
Join Date: July 11, 2009
Location: PHOENIX IT'S A DRY HEAT AZ
Posts: 844
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Back in the 70's I did a lot of experimenting with this ,1 in 10 is the answer without any doubt.
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#12 |
Senior Member
Join Date: April 22, 2007
Posts: 1,996
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My Howa 1500 has a 1:12 24" barrel. It shoots 175gr SMK better than 168gr SMK's...but I have only shot it out to 300 yards.
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#13 |
Senior Member
Join Date: July 11, 2009
Location: PHOENIX IT'S A DRY HEAT AZ
Posts: 844
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Ther is no problem shooting 168 Amax or SMK or 175 grain SMK out of a 20 inch in 1-10 at 300 yards . You don't need a 26 inch barrel for a .308 . A 20 in a 1-10 is going to be what you want .
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#14 |
Senior Member
Join Date: June 11, 2007
Posts: 2,164
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#15 |
Senior Member
Join Date: September 6, 2007
Posts: 1,204
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1:10
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#16 |
Staff in Memoriam
Join Date: November 13, 1998
Location: Terlingua, TX; Thomasville, GA
Posts: 24,798
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'06 stuff, but...Years back I did a lot of varmint hunting with 110-grain bullets. My 1:10 twist let me get nice, tight groups. Works okay with the Sierra 180 SPBTs, as well. And, just for fun, adequate with 80-grain pistol bullets.
Odds are that a 1:12 is a bit slow for anything over a 165, but that's a bit of a "sorta-educated" guess. ![]() |
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#17 |
Senior Member
Join Date: July 25, 2010
Posts: 364
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Thanks guys.
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#18 |
Senior Member
Join Date: July 3, 2004
Location: Upstate NY
Posts: 129
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I run 180g SGKs out of my gas gun with a 1:12 bull barrel. No stabalization problems to report even in cold conditions.
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#19 |
Senior Member
Join Date: March 12, 2005
Location: Bora Bora
Posts: 932
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My Sako .308 is 1/11 and shoots just great. Too fast and it can cause problems and increase barrel wear depending on the bullet being used. I've seen 1/10, 1/11 and 1/12 used by reputable MFG's. There may even be others?
Use this formula for the specific bullet you plan to use. TWIST rate = D2 C / L x (sq root of ) SG/10.9 Where: • C = 150 (*180 for muzzle velocities higher than 2,800 f/s) • D = bullet's diameter in inches • L = bullet's length in inches • SG = bullet's specific gravity (10.9 for lead-core bullets) |
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#20 |
Senior Member
Join Date: July 20, 2008
Location: Mississippi
Posts: 2,654
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HK beat me to it.
11.25 ![]() |
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#21 |
Senior Member
Join Date: March 12, 2005
Location: Bora Bora
Posts: 932
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Sorry Black!
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#22 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
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whether a bullet will stabilize with a particular twist depends on 4 things 1) length of the bullet 2)Diameter of the bullet 3) velocity of the bullet 4) specific gravity of the bullet.
Here is a online calculator which uses the Miller formula that should help you out assuming you know basically what bullet you will be loading and the appx velocity you can expect if you have a bullet to out a mike on. manufactures are not exactly free with that data and the easiest way would be to find a box an measure them. Play with it a bit and you will see that the lower the velocity the shorter the bullet has to be for the same barrel twist. http://kwk.us/twist.html using a .308 Berger 155.5 Palma bullet which is 1.4 inches long and which I shoot at 2775 I am good to go with my 1:12 barrel Now to confuse matters even more the shape of the bullet affects the length. A 155 Gr SMK is 1.202 inches long because it uses a tangent ogive rather than a secant + tangent hybrid profile like the Berger. BTW the SMK's shoot just as well if not better in my gun than the higher priced Bergers do. A buddies same brand/model gun is just the opposite and loves the Bergers if you want to know the hows and whys and want to get a math headache then this read this http://www.jbmballistics.com/ballist...tability_2.pdf but the bottom line is this, forget the math and get whichever gun you like the best and play with some bullets and powders to get the accuracy the gun likes the best. What do you plan on using the gun for varmints in N Dakota or deer hunting in Tennessee. Get the one that you would be happiest with, If you want to use it for LR then 1:12 155's will do you just fine, that is a s heavy as the 1000 yard Palma shooters are allowed.
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#23 |
Senior Member
Join Date: December 3, 2002
Posts: 1,264
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I shoot my match M1A with a 1:12". This gets me 125's at short range (200yds) and 155/168/175's the rest of the way to 600yds. The M1A isn't as flexible with velocities, but for a bolt gun, I'd go with a 1:11 or 1:12.
I'd go with a 1:10" if I had a regular need for 180+grs. For daily use, I think the slower twists are much more versatile. |
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#24 |
Senior Member
Join Date: July 11, 2009
Location: PHOENIX IT'S A DRY HEAT AZ
Posts: 844
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The OP said all around jack of all trades 147 to 175 . To me this means long range hunting is on the table also. A 20 inch in 1-10 is going to be great for humping around the woods and takeing Deer and elk at range. As far as punching paper a 20 inch in a 1-10 is fantastic for 168 and 175,178 SMK or Amax .
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#25 |
Senior Member
Join Date: July 20, 2008
Location: Mississippi
Posts: 2,654
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I'd want 24" for elk just to hit him harder, but i love 18.5s and 20" .308s so i agree with Gonif also
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