I have a 40-70 SS rifle with a 0.408 bore and a freebore of 0.410 that is 0.300 long. I have a boolit that shoots great with smokeless but I have to have several grease grooves exposed for the bullet to just engage the rifling when chambered. I am thinking of having a new boolit mould built that eliminates the top groove (3 would be left) and make a section that is 0.250 long at 0.410 diameter. Using 20:1 alloy, would this work with a length of 0.250 without any lube? Looking for a hunting boolit that is easy to carry in your pocket! Thanks. Bulseyetom