andym79
07-14-2017, 08:52 PM
Hi guys I am thinking of having a 338 caliber rifle built.
The longest bullet I want to shoot from it will be 1.3" 278 grain.
I obviously want something that will stabilize that, preferably at around 1000fps, but also want to be able to shoot shorter bullets fast.
Standard twist for the 338 is pretty much universally 1:10 because some jacketed bullets are as much as 1.8" long.
I plan on only shooting cast!
A 1:10 will limit my uper velocity to 1600fps (before accuracy heads south).
1:10 twist is available to be easily, 1:12 easily but at cost a 1:14 only if I go to the hassle of importing from overseas.
What sf should I be aimming for as a minimum? 1:12 at 1000 gives a SF 2.1 1:14 at the same SF 1.6.
What twist should I go for, by that I mean which would be the most versatile for cast assuming that no bullets longer than 1.3" will ever be used?
The longest bullet I want to shoot from it will be 1.3" 278 grain.
I obviously want something that will stabilize that, preferably at around 1000fps, but also want to be able to shoot shorter bullets fast.
Standard twist for the 338 is pretty much universally 1:10 because some jacketed bullets are as much as 1.8" long.
I plan on only shooting cast!
A 1:10 will limit my uper velocity to 1600fps (before accuracy heads south).
1:10 twist is available to be easily, 1:12 easily but at cost a 1:14 only if I go to the hassle of importing from overseas.
What sf should I be aimming for as a minimum? 1:12 at 1000 gives a SF 2.1 1:14 at the same SF 1.6.
What twist should I go for, by that I mean which would be the most versatile for cast assuming that no bullets longer than 1.3" will ever be used?