hello;
ok well first off im building a 4 bore. Ive already built a few cases out of copper tubing with a brass plug to accommodate a 209 primer,plugs are silver soldered in. the id of the cases are 1.030.(its close to a 4 bore anyway). Now for a barrel I was thinking about a 1.027 dia tube of correct thickness. I already have a gun barrel maker lined up as well.The groove to groove dia would be 1.030. Is .003 depth for the rifling deep enough? I haven't decided on a weight for length of a bullet yet if that has anything to do with the depth. hope you can help thanks.