Although I have a nice selection of modern pistols and revolvers, I'm considering a Thompson Contender for a change of pace. What I need is some advice on caliber choice to keep recoil at a manageable level. I currently shoot 44mag and 460 Rowland full power loads in my 6" S&Ws with no problems. What TC rifle calibers (if any) would give me a similar recoil level? I'm not a hunter so that's not really a consideration. Advice?