Ablrs, tlrs, tgks and vlds will need a fast twist, partitions etc, standard 10 as @LoonWulf said. Personally if you're gonna milk that cartridge for everything it's worth get a fast twist, my sole regret on mine is that a fast twist isn't even an option.Hi, im looking at a custom barrel for a rem 700 build. Im going to get the barrel 20" long in 270 winchester. The question I have is what twist rate should i get. I will be shooting bullets 140-150gr.
Thanks,
Tucker
Several high bc hunting bullets catching on in .277. Doesn't have to be target related.I should mention this is a hunting rifle so i will be shooting hunting bullets only.
Tucker
The 150ablrs didnt stabilize in two 1-10 .270s ive worked with. The 145 eldxs did tho.Several high bc hunting bullets catching on in .277. Doesn't have to be target related.
I'd still go with a 1-8 or so. You give up nothing, and gain the ability to shoot VLDs should you desire them at a later date.
In a semi-auto there is increased gas port pressure and increase in total bore pressure.As the others have mentioned what's the downside of choosing a faster rifling twist rate?
So in a 20" barreled .270 Winchester rifle, most likely bolt action as the OP mentioned Remington 700 action, and given the OP's list of options from 1:7 to 1:10 inches rifling twist rate, since that's the topic of discussion in this thread, I stand by my question.In a semi-auto there is increased gas port pressure and increase in total bore pressure.
I don't see over stabilisation as a problem in my shooting, but over spinning a bullet can have a detrimental effect in terminal performance, causing premature failure.
I find a fast twist barrel gives a more dramatic hit on varmints than a standardly spun bullet, allowing the centrifugal forces to "explode" the bullet.
Poof!
For very long range an overspun bullet can resist changing the angle of flight and hit the target nose up, instead of nose on.
This can also affect the flight of the bullet, as it is now no longer aerodynamic and hitting the wind in one full side of the shank, sucking away the BC and even influencing accuracy.
Truth.I'd still go with a 1-8 or so. You give up nothing, and gain the ability to shoot VLDs should you desire them at a later date.
I was watching a utube video of bullets doing that in flight, looked pretty cool.Poof!
Do you have a barrel maker in particular of interest? Some only make .277 in certain twists. For instance, a few such as Bartlein offer only 1:10.
Unless you are looking to fire only those super long Berger 170’s which necessitate a 1:8, I would look at either 1:8.5 or 1:9. I believe these two twists will give you the highest offerings of bullet weight accuracy. Brought on offers a 270 barrel in 1:8.5 that I’ve heard to be quite something special.
I agree with the above. If doing a custom barrel setup, there is no reason to stay with the normal 1:10 just because! Design the specs to what you want to shoot. If you are planning ONLY light bullets, go with the 1:10. more likely to shoot those long Bergers ONLY? Go 1:8. But if you are planning to experiment with several weights, and simply want the ability to shoot ANY ammunition to its fullest potential then go 1:9 or 1:8.5.
I have the option of 1 in 7,8,9,10, or 11