|
|
|
Discussion Forums
Forum Index
> Rifles general discussion
> 220 Swift in a tight twist barrel
220 Swift in a tight twist barrel
@ 12:50 pm (GMT) |
Murray McGehanI am currently planning the building of a 220 Swift based on a Remington Model 700 long action. The reason for the long action is I intent shooting bullets in the 70 to 85 grain weight range with bullets seated close to or slightly over max cartridge length. I am looking at a Trueflite 26 inch barrel with a 7 inch twist. Has anyone had any experience of shooting heavier bullets in the Swift and any pitfalls or traps to watch out for. |
Replies
@ 02:16 pm (GMT) |
Nathan FosterRe: 220 Swift in a tight twist barrelHi Murray, this one is fairly straight forwards. In the old days, it was known / established that a fast twist caused jacket core separation (i.e. mid air bullet blow up) in the Swift (due to the typically thin jackets used in .224 cal).Hop over to the Berger calculator and input the bullet you want to use versus the twist rate, then calculate stability. Ideally, you'll want to be right around the 1.5 range. 1.4 to 1.5 is fine. But as you go over 1.6, things can get a bit finicky. Basically, don't put BC ahead of material limits, physics, common sense etc. All the best. |
|
@ 09:58 pm (GMT) |
Murray McGehanRe: 220 Swift in a tight twist barrelThanks Nathan, just the info I was after. |
Please wait
ABOUT USWe are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.
|
KNOWLEDGEBASE |
KNOWLEDGEBASE |