Why I hate 1:7 twists

[Phil Hirsh]

My 556 won't digest anything with any accuracy unless it's 70 grains or heavier. I have tons of 5.56 55 and 62 grain and the Sig is very ho hum with this stuff. I'm selling the damn thing. My flat top AR outshoots it effortlessly.

[Lumpy196]

Wouldnt that be a reason to hate your Sig 556?

[variablebinary]

My 556 won't digest anything with any accuracy unless it's 70 grains or heavier. I have tons of 5.56 55 and 62 grain and the Sig is very ho hum with this stuff. I'm selling the damn thing. My flat top AR outshoots it effortlessly.

Dont buy low rent versions of established firearms is today's lesson...

[Yojimbo]

I can't say anything about the 556 but AR carbine with 16", 1/7 barrels shoot 45, 55, and 62 grain ammo pretty well...

[VA_Dinger]

Why would a Sig556 1/7 barrel be any less accurate with 55 grain?

I don't see the connection.

[Phil Hirsh]

I just prefer 1:9 twists as being more versatile. If only the SIG had a 1:9 twist. I know that heavy bullets are in vogue now but my lighter bullets just don't perform up to my standards in a 1:7 twist. I hunt a lot of varmints and need a precise machine. The SIG has been my first experience with 1:7. I shot DCM on a shortened range with reduced diameter targets so I never loaded anything over 63 grains.

[DrMark]

1:7 twist works well for me with 55 and 62 grain rounds.

Then again, I don't have a SIG 556.

[VA_Dinger]

I've shot a lot of 55 grain rounds through 1/7 barrels over the years and never noticed any accuracy loss.

I also see no reason why your Sig556 1/7 barrel would be any different. Is this factory 55 grain ammo?

[Redmanfms]

Every 5.56mm-chambered rifle I own has a 1/7 twist. I've never had issues with the lighter projectiles in terms of accuracy, however; I have noticed that the .223 varmint loads don't tend to fragment reliably when shot out of an AR (v. the 1/12 in my varminter), but the accuracy is just fine.

[Shihan]

I just prefer 1:9 twists as being more versatile. If only the SIG had a 1:9 twist. I know that heavy bullets are in vogue now but my lighter bullets just don't perform up to my standards in a 1:7 twist. I hunt a lot of varmints and need a precise machine. The SIG has been my first experience with 1:7. I shot DCM on a shortened range with reduced diameter targets so I never loaded anything over 63 grains.

All barrels are different and all 1/7 I have shot and that is quite a few. I think your sig barrel is what your unhappy with and not the twist rate.