21 November 2010, 14:33
ross10Twist rate for a Capstick
I am building a 470 Capstick and I would like to know what twist rate people use for bullets in the 275 to 500 grain range. Ross
21 November 2010, 14:58
michael458Ross
Traditional twist rate for the Capstick is 1:10. Which is excellent with the right bullets.
Michael
http://www.b-mriflesandcartridges.com/default.htmlThe New Word is "Non-Conventional", add "Conventional" to the Endangered Species List!
Live Outside The Box of "Conventional Wisdom"
I do Not Own Any Part of Any Bullet Company, I am not in the Employ Of Any Bullet Company. I do not represent, own stock, nor do I receive any proceeds, or monies from ANY BULLET COMPANY. I am not in the bullet business, and have no Bullets to sell to you, nor anyone else.
22 November 2010, 19:21
jens poulsenWhy would anybody need such a steep twist for a 500grain bullet in .475cal?. My own .416Rigby has 1.14 twist and shoots 500grain hawkbullets just perfect!.
I believe the twist for a .470Nitro is about 1:18 shooting 500grain aswell.
22 November 2010, 20:07
michael458quote:
Originally posted by jens poulsen:
Why would anybody need such a steep twist for a 500grain bullet in .475cal?. My own .416Rigby has 1.14 twist and shoots 500grain hawkbullets just perfect!.
I believe the twist for a .470Nitro is about 1:18 shooting 500grain aswell.
You need this twist to work with terminal penetration. Faster twist rates are able to stabilize solids better for straight line penetration. If you use a slow twist, and a bullet that has a less than optimum meplat, less than 65% of caliber, then it is difficult to get stability during terminals.
See "terminal Performance" thread here in big bores, fully explained and tested, and proven.
Your 416 Rigby with it's 1:14 is not optimum for this with 400 gr solids--very good for 350s to 370, the only way you can do better with the 400s is use an optimum bullet, North Fork or Barnes Banded with meplat sizes from 65% to 70% of caliber, and increase velocity.
This is for solid penetration--has nothing to do with accuracy or terminals of soft points, the faster twist has no negative or positive effect on those, at DG ranges.
Michael
http://www.b-mriflesandcartridges.com/default.htmlThe New Word is "Non-Conventional", add "Conventional" to the Endangered Species List!
Live Outside The Box of "Conventional Wisdom"
I do Not Own Any Part of Any Bullet Company, I am not in the Employ Of Any Bullet Company. I do not represent, own stock, nor do I receive any proceeds, or monies from ANY BULLET COMPANY. I am not in the bullet business, and have no Bullets to sell to you, nor anyone else.
http://www.b-mriflesandcartridges.com/default.htmlThe New Word is "Non-Conventional", add "Conventional" to the Endangered Species List!
Live Outside The Box of "Conventional Wisdom"
I do Not Own Any Part of Any Bullet Company, I am not in the Employ Of Any Bullet Company. I do not represent, own stock, nor do I receive any proceeds, or monies from ANY BULLET COMPANY. I am not in the bullet business, and have no Bullets to sell to you, nor anyone else.
