I've been a reader of this site for a long time, but have never posted on this site. So call me a newbie... I have a question. I have a 45-70 guide gun and love shooting it. I have primarily shot the Hornady Lever ammo, and have not been disappointed. Owning this rifle though has spurred on other hobbies. Namely, cast bullets. I am casting 405 grain Lee bullets and want to shoot them so bad. But...I have not been able to find new brass with all of the gun **** (BTW, I live in little California, COLORADO). So in reloading I know that I shorten the brass for Hornady rounds. They also caution in the Hornady book that the shortened brass is ONLY for the Hornady ammo. I am wondering though, if I stayed with tame powder loads, what would happen with the 405 grain ammo? Do I dare try? Could I over pressure the case? Now see what the anti-gun morons have gone and done? I always tell my kids to follow directions and now I'm trying to seek advice on if I could break with the directions. Any advise would be appreciated.