I have a Henry X Model and a Marlin 1895 lever actions. I am shooting a 350gr LFN gas check bullet and I have to seat .10" deeper for them to cycle. Book says to seat at 2.55" and I have to seat at 2.45". I have not attempted to try them, not knowing what the pressure will do. I used 38.8 gr of IMR 4198 and a factory crimp. The crimp groove is inside the case by about 1/8th of an inch. Are they safe to try? Also, does anyone have 50 fired Hornady 45-70 short brass?