.308win rifling twist

[wildphil24]

I'm an M1A guy not yet shooting past 4-500m. For cheap pratice I shoot 145-150gr FMJ bullet but for moose hunting I use 180gr. Like most of you, my hunting shots are mainly under 100m but can potentially stretch to 4-500m.

If I get a new rifle with a 1-12" twist, what should I expect when I switch to the heavy bullets?
Would the 180gr group twice tighter with a 1-10" (all else being equal)?
Or would I just have to try more ammo to find the one that shoots well in the slow twist?

Thank you,
Phil

 

[AKD]

1-12" is fine for just about all 180's. a 1-10" will help you if you want to go heaver for the majority.

Best twist for your practice bullets as well would be a slower like 1-14" but as you can see, its not a big deal at that range. and a faster twist with in limit is better than a slower un stable twist.

 

[Obtunded]

Everything you can realistically shoot out of a 308 will work FINE with a 12 twist. There is no reason to ever use a 10 twist on a 308 for even reasonably conventional loads.

Even the Berger 185 match bullet will work with a 13" twist.

Remember too, weight has nothing to do with twist requirements, it is the length of the bullet and the specific gravity of the materials from which it is made.

 

[wildphil24]

Good info, thank you guys. Good news too since 1-12" is what I have available and should be perfect for my use.

Remember too, weight has nothing to do with twist requirements, it is the length of the bullet and the specific gravity of the materials from which it is made.

I learned something here. I guess the bullet weight is often the reference for this matter because it's easier to set and is generally proportionate to the lenght with the usual lead-copper.