Bullet grain v. Barrel twist

[Catfish]

Burger list the recomanded twist rate for all of their bullets on their web page and you can use it for a good rule of thumb. As Rocky said though it is lenth and not weight that rules which doesn`t mean much with jacketed lead core bullets in the same cal and of close to the same shape. There will be some varation but not enough to make a difference in field shooting. Where you came get into big time trouble is when you move from jacketed lead core bullets to something else like the Barns X bullets which are solid copper and are much longer for the same weight lead core bullet. The longer the faster the twist needs to be. Velosity also plays a part since it`s rpm`s we`re looking for the higher the velosity the slower the twist rate of the barrel need be, but not by much.