scott63 Posted March 15, 2007 Report Share Posted March 15, 2007 Sarco is advertising .30 cal FN barrels with a 1/12 twist, unchambered and straight diameter. Has anyone used/bought one of these? what weight of bullet is that twist good for? I see most 30 cal barrels are 1/10 twist......Thanks...........Scott Link to comment Share on other sites More sharing options...
AzRednek Posted March 15, 2007 Report Share Posted March 15, 2007 Sarco is advertising .30 cal FN barrels with a 1/12 twist, unchambered and straight diameter. Has anyone used/bought one of these? what weight of bullet is that twist good for? I see most 30 cal barrels are 1/10 twist......Thanks...........Scott I haven't looked at the ad but you might want to drop them a line and see if these are machine gun barrels. Might be long and heavy and with the twist rate likely not any good for lightweight varmit type bullets. My guess a 180gr or heavier bullet would work best. Link to comment Share on other sites More sharing options...
Limpid Lizard Posted March 15, 2007 Report Share Posted March 15, 2007 I might be right, I might be wrong, I might be crazy, but if I intend to use 165 or lighter bullets in a 30 cal I use a 1/12. Heavier than that and I use 1/10. The 1/10 is pretty much standard for '06 and larger. The 1/12 is standard for .308 where the manufacturers are willing to stock two twists in one caliber. 1/14 is not all that uncommon in 30 caliber either. LL Link to comment Share on other sites More sharing options...
scott63 Posted March 15, 2007 Author Report Share Posted March 15, 2007 I haven't looked at the ad but you might want to drop them a line and see if these are machine gun barrels. Might be long and heavy and with the twist rate likely not any good for lightweight varmit type bullets. My guess a 180gr or heavier bullet would work best. They're supposed to be barrels for sniper rifles........ Link to comment Share on other sites More sharing options...
Bennypapa Posted March 15, 2007 Report Share Posted March 15, 2007 Refresh my memory... Within a given caliber do heavier bullets need faster twist than lighter bullets? Ben Link to comment Share on other sites More sharing options...
AzRednek Posted March 15, 2007 Report Share Posted March 15, 2007 They're supposed to be barrels for sniper rifles........ I learned many years ago to take anything SARCO says with a grain of salt!! Link to comment Share on other sites More sharing options...
AzRednek Posted March 15, 2007 Report Share Posted March 15, 2007 Refresh my memory... Within a given caliber do heavier bullets need faster twist than lighter bullets? Ben Don't rely on my judgement. I thought it was the other way with 30 cal bullets. Link to comment Share on other sites More sharing options...
Racepres Posted March 15, 2007 Report Share Posted March 15, 2007 In both my 6mm'06 and one of my 22-250's, heavier bullets do not shoot well, supposedly since my rifling twist is too slow! IE If the twist was 1:8 instead of 1:12 it would stabilize heavy bullets... But this is just my experience w/ all of 2 barrels... MV Link to comment Share on other sites More sharing options...
Limpid Lizard Posted March 16, 2007 Report Share Posted March 16, 2007 Projectile length rather than weight is the deciding factor. A heavy round nose will stabilize in a slower twist than a long spitzer will. That is why there are no hard and fast rules pertaining to specific weights per twist. LL Link to comment Share on other sites More sharing options...
Doble Troble Posted March 17, 2007 Report Share Posted March 17, 2007 Maybe this Brownell's cheat sheet will help. Those guys at Brownell's are good. I buy from them whenever it doesn't make obvious sense to buy them somewhere else. They define customer service - but you do pay for it - and in some cases it's worth it. I would actually prefer a 1:12 .308 barrel to a 1:10. I wish that I could shoot a 1:12 in Garand matches. I'm sure that the 152 gr M2 bullets would fly out of a 1:12 better than the stock 1:10. Link to comment Share on other sites More sharing options...
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