1 In 7 Twist


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zapped
June 6, 2009, 08:51 PM
Is a 1 in 7 twist rate too fast for a 50/55gr bullet in the 223?

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taliv
June 6, 2009, 08:56 PM
it's not optimal, but it works just fine. all my ARs are 1/7 and i've shot tens of thousands of 55g m193 through them.

NCsmitty
June 6, 2009, 09:04 PM
+1 for taliv.

The only caveat involves Sierra Blitz and Hornady SX bullets which have very thin jackets and can vaporize out of the barrel because of the high rotational speeds.

NCsmitty

zapped
June 6, 2009, 09:30 PM
OK,

So the 50/55gr bullet would stabilize and be accurate at long range, say 300-400yds.

Thanks for the replies.

taliv
June 6, 2009, 11:13 PM
it's not clear what you're doing

1/7 is a twist typically used in AR15s and whatnot with 55/62/75+ grain military-style FMJ and OTM bullets

varmint bullets like NCsmitty mentioned come in 50g and 55g (and 52, 45, and smaller) but are usually used with much slower twists, like 1/12

1/7 and 55g combo is fine for hitting steel and silhouette sized targets at 300-400, but it would likely be a little frustrating trying to hit a p-dog at that range with that combo, so you'd be better off with a typical varmint setup

kwelz
June 7, 2009, 01:40 AM
1/7 is fine for anything that is commonly available. The only bullets it will have problems with are the super lightweight bullets but I don't see to many of those.

Badger Arms
June 7, 2009, 01:52 AM
1-in-7 is OPTIMIZED for around 70gr lead projectiles or 64gr tracers, IIRC. It fires 55gr just fine but overstabilizes them. More fouling (due to faster bullet and steeper rifling) and reduced terminal effects can be expected, though. Less than 55 it's a crap-shoot. I can only speak from personal experience.
I'd shoot 69/70gr bullets all day if they were less expensive.

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