Doubleriflejack,
I am getting ready to build a .577 light nitro rifle on a Mercury 10 gauge 3 1/2 inch frame. I will be using three inch cases and reamer but I want to load it the same as the 2 3/4 light nitro loading. Do you think in this case that the rifle needs to weigh 13 pounds? I was going to shoot for a finished weight of 10 1/2 to 11 pounds, is that too light for the recoil involved? This shot gun had the barrels ruined by some guy trying to put screw in choke tubes in it. Then the current owner cut the barrels back to 26 inches. As it stands now, the gun weighs 10 pounds 4 ounces. It has the Greener crossbolt and the action is 2.6 inches across the face. It was proofed at 850 KGS and I'm making a guess that that is per square centimeter, is that correct?
What would this proof be in pounds per square inch and what kind of loads should we proof it for? I think a 650 grain bullet at 1800 FPS is plenty of power for the new rifle, I am just wondering what the pressure is on that load and what level would you proof it at for that load? Should I fill the additional space up in the case with shotgun wads or some kind of fluffy fiber filler? Thanks to all for any help on this project. I am a little in the dark here because this is quite a bit bigger than anything I have built to date. Bob