I don't need the grooves to be deep, I'm shooting multiple .36 caliber soft lead balls in a plastic wad/ shot cup. A single pass with a broach would likely be enough to achieve my goals. I believe a 1 in 20 twist is about as fast a twist rate as the plastic wad would accept. I fired this load combination in my Saiga, with a rifled choke tube, and shreded the wad, without any noticible change to the pattern. Thanks for the replies, keep 'em comming. Paul.
|