I would look at hydraulics reshaping the bullet before dieseling. Rifling displaces lead, lead displaces lube, lube has to go somewhere. It’s going to push back on the lead and on the gas check. The result is a longer thinner cast bullet.
On that topic, as a kid I used to over-oil my Daisy on purpose, to get it to Diesel. When first over-oiled it…[Read more]