I am looking to have my model 70 rebarrled. Its chambered in 270 weatherby and I want to stay with that. I am wanting to be able to shoot the matrix 165 and 175bbullets. I was wondering what twist would be needed for these bullets? And who makes fast twist barrels for 270's? And also just wanted thought on how the gun might performe with these bullets? The gun would only be used for play and maybe deer.