I have a 45-70 and shoot a 500 grain bullet. My overall length is 2.820 with a seating depth of .625 with a.030 wad. With 65.0 grains of goex 2f my compression is around .375. All i am reading people are loading 68.0 to 70 grains. What is too much compression and will other brands of black powder allow more capacity?