Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Posted: 9/24/2004 5:52:04 PM EDT
Which rifling twist is best for optimal accuracy with standard mil spec 5.56 ammo?
I am currently using XM193 55 gr.
It seems that each manufacturer claims what ever he is using is optimal over a wide range
of bullet weights.

I figure you guys will be much more helpful.......
Link Posted: 9/24/2004 5:53:11 PM EDT
barrel length?
Link Posted: 9/24/2004 5:58:13 PM EDT
Also, have you read this?

Link Posted: 9/24/2004 5:58:32 PM EDT
If only using 55's, myself I'd go with 1 in 12.

55 to 68 grain go 1x9"

Link Posted: 9/24/2004 6:04:01 PM EDT
55 grain 1 in 12 or 1 in 14.
Link Posted: 9/24/2004 6:11:13 PM EDT
1/7 takes any weight bullet.I have both 1/9 and 1/7 and I use primarily 55 grain but do keep 77 and 80 grain around for matches.1/9 should work with bullets up to 69 grain.
Link Posted: 9/25/2004 11:53:27 AM EDT
No, I have'nt read the ammo oracle yet> I'm going there now thanks.

I am assuming from what I have seen so far around here, that with the 55 gr 5.56 XM 193 I shouldn't see any difference in accuracty between the 1/7 & 1/9. Right?

Now, all that is left is to decide on a 16" or 20" HBAR. Advice...opionions...???

Link Posted: 9/25/2004 1:38:35 PM EDT
W/ 55gr ammo, both 1:7 or 1:9 will be able to stablize it pretty well. You shouldn't see much difference.
Link Posted: 9/25/2004 2:40:56 PM EDT
Longer barrel will give greater muzzle velocity:

- about 25 more yards of fragmentation range with M193 (see Frag charts pinned post in Ammo area) if used in SD or SHTF

- less bullet drop and wind drift at longer ranges so likely more accurate if any sort of shooting at 250yds+ is expected.

At short range (up to 100 yds), probably no practical difference btw 16 and 20.

And certainly the 16 will be lighter to carry and less nose-heavy than the 20.

Top Top