Why 1/7 ? > Rifles, Uppers, Lowers, Barrels, and more

Posted: 7/12/2006 6:39:27 PM EDT

Why do some manufacturers like LMT & CMMG make nearly all their barrels in 1/7 twist? I'm guessing to adhere as close as possible to mil-spec. The reason I ask is: I know that the military like the 1/7 to stabilize the long tracer bullets. But we civies don't shoot so much of the tracers, mostly the 55 gr. & 62 gr. surplus stuff. How well will the 1/7 work w/ these bullets?

Jim762

Posted: 7/12/2006 6:43:35 PM EDT

[#1]

Quoted:
Why do some manufacturers like LMT & CMMG make nearly all their barrels in 1/7 twist? I'm guessing to adhere as close as possible to mil-spec. The reason I ask is: I know that the military like the 1/7 to stabilize the long tracer bullets. But we civies don't shoot so much of the tracers, mostly the 55 gr. & 62 gr. surplus stuff. How well will the 1/7 work w/ these bullets?

Jim762

Jim

This has been a subject of endless debate on this forum.

Plainly stated the 1:7 does everything the 1:9 does and also handles the heaviers bullets.

Denny

Posted: 7/12/2006 6:43:59 PM EDT

[#2]

Why are all of these threads titled "why 1/7", etc.? Why not ask "why 1/9?"

Posted: 7/12/2006 6:53:08 PM EDT

[#3]

Quoted:
Why are all of these threads titled "why 1/7", etc.? Why not ask "why 1/9?"

Posted: 7/12/2006 6:57:25 PM EDT

[#4]

Quoted:
Why are all of these threads titled "why 1/7", etc.? Why not ask "why 1/9?"

+2

Posted: 7/12/2006 8:57:06 PM EDT

[#5]

Quoted:

Quoted:
Why are all of these threads titled "why 1/7", etc.? Why not ask "why 1/9?"

+2

+3

TS

Posted: 7/12/2006 9:14:03 PM EDT

[#6]

And a +4.

"Why not?"

You can shoot everything a 1/9 can shoot, and more. Some say the barrel wears faster. I'll worry about that once I shoot one of my 1/7s smoothe.

Posted: 7/12/2006 10:40:48 PM EDT

[#7]

Why not have a barrel that will shoot everything but the thinnest jacketed varmint bullets without a problem? 1-7 is the best choice for the selection of bullets available today.

So what if it won't shoot 40 grain TNT's well? If you wanna shoot 4 legged varmints, get a varmint gun in 1-12

If it's for 2 legged varmints, 1-7 is a good choice with 77 grain ammo.

J

Posted: 7/12/2006 10:46:59 PM EDT

[#8]

I've shot a number of 40gr loads thru a 1:7 20".

The only problems I had was some midflight jacket failures from some of the (long) discontinued Federal blitz.

That said I dont see a need for those (now) even when shooting varmits - the 52gr Hornady work fine

Posted: 7/13/2006 4:44:02 AM EDT

[#9]

The guys above pretty much nailed the "Why" of the 1/7 twist.

One of the mods should tac one of the 1/7 vs 1/9 threads...

Posted: 7/13/2006 7:43:02 AM EDT

[#10]

Thank you for sharing info. I do understand why manufacturers would go with the 1/7 twist. Please know that I was only seeking explanation/info, I was not trying to start a 1/9 vs. 1/7 or flame the 1/7. Thanks again.

JIM762

Posted: 7/14/2006 12:28:47 PM EDT

[#11]

Quoted:
Why do some manufacturers like LMT & CMMG make nearly all their barrels in 1/7 twist? I'm guessing to adhere as close as possible to mil-spec. The reason I ask is: I know that the military like the 1/7 to stabilize the long tracer bullets. But we civies don't shoot so much of the tracers, mostly the 55 gr. & 62 gr. surplus stuff. How well will the 1/7 work w/ these bullets?

Jim762

I bought a lmt with the 1/7 twist

so I can shot the Long bullets

Found out tha my 1/9 bushy shoots the 77gr FINE

Warning

Confirm Action

[ARCHIVED THREAD] - Why 1/7 ?

[ARCHIVED THREAD] - Why 1/7 ?