light and middle weight bullets in a 1:7?

[mattjmcd]

Most of my experience to date has been with 1:9 bbls and 55gr and 62gr ammo. Now that I am getting a bit more serious, I am wonder how those bullet weights will *really* fare coming out of the end of a 1:7 (or maybe a 1:8) tube?

I have been looking into DD uppers and similar offerings from LaRue. They are tighter twist platforms. Should I expect a real degredation in performance with 55gr and 62gr bullets in those rifles? I am NOT talking about the really light varmint rounds, mind you. 55gr is about as light as I ever shoot.

Thanks for the input.

[28_days]

Are you referring to over-stabilization? Unless I'm mistaken, 1:7 and 1:8 twists are able to handle a plethora of bullets weights without any issues. 55gr and 62gr will be absolutely no problem at all. There's a graph floating out there as well where someone tested this theory, it essentially proves that these twist rates are more versatile then the "others".

[GONIF]

Shoot XM193,and Q3131 (55 grain)all the time in 1/7 with no problem and good accuracy. don't know about crap 55 grain ammo but these work fine.

[marty]

An article on this subject FYI

http://anarchangel.blogspot.com/2007/01/stabilization-mythology.html

[marty]

GONIF

When you say: "Shoot XM193,and Q3131 (55 grain)all the time in 1/7 with no problem and good accuracy. don't know about crap 55 grain ammo but these work fine."

At what distances are you shooting?

I too am a 1:9 guy thinking about getting a 1:7.
My 1:9 in a 16in. barrel can hit a 2ft x 2ft steel goong at 650 yards consistently using 55gr M193 and my 4x scope.

I'm curious what other shooters may be experiencing at these ranges using a 1:7 with 55 gr. and a 16in. barrel. Let me know as I ponder picking up a 1:7.

[PRGGodfather]

For the the most part, 1/7 twist in any barrel length allows you to use heavier than 55 grain bullets all the way up to 75+ grains. You just don't want to shoot anything lighter than 55 grains with 1/7.

With a 1/9, you can go down to 45 grains, but not much higher than 62-69 grains before you experience yawing problems.

Light bullets with a slower twists make some excellent keyholes.