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I was looking at getting A Shilen barrel from Brownell a and noticed they are in 1-10, I don’t know how much difference that will make..
And also how much of it will fit in a Mauser length action

Excellent! with regard to case forming, did you just run the 7x57 brass into a FL 6mm imp die? or were there other forming steps? fireforming included?
What twist do you think would have been better...

Chaps does anyone here own and shoot a 6mm Rem AI?
Interested in hearing feedback on your experiences. What bullet choices are you using in what makes and twists of barrels, barrel life, accuracy...