I know it's an insane idea but I'd like to shoot some black powder without the mess of muzzleloading. I recently acquired an M95 in 8x56r and looking at the case I noticed it could be shortened to a couple inches and possibly expanded to .458. Then I came to the idea of an ultra cheap project for a single shot black powder straight pull rifle. My favorite gunsmith has the license to build custom rifles so he can find a M95 receiver complete with trigger and an used octagon .45 barrel from a muzzleloader. I'll make the stock (I'm quite proficient in wood working) and with the bolt of my hungarian I'll be finally on the market. The only problem I see is in cases cause I dont want to alter my bolt. How much I have to shorten it to avoid neck cracks?