Hello, I'm in need of advice. I'm going to have a 257 magnum built. It will be 26 inch proof barrel carbon fiber. Will be shooting 100 grain bullet. Plus or minus 10 grains. What is the best twist rate for this?
Yes, there is a form to be filled out for customs at the boarder and a permit from Mexico that has to be bought and filled out. Plus Mexico will want to know the number of shells you are bringing in.