Thats pretty much normal in my accura as well. Get a palm saver that slips over your ramrod. It really helps out with all bullets. They get slightly tighter right down towards the breech and with the thor being copper, you'll feel that tightness a lot more than you would with say a lead conical or sabot.
On my TC the .502s fit just perfect, the pressure was the same from top to bottom. I cant report yet on the .45 Knight, still waiting, and waiting, and waitinggggggg.
