Falcon, congrats on your purchase. Now as for powder charges, don't go dumping large amounts of powder down the bore. Be methodical in your load development. Start with one bullet weight and 70 gr of powder (by volume not weight). Work your way up in 10 gr increments. Take lots of patches and alcohol and swab between each shot for consistancy. Shoot 3 shots with each load. You should see your groups possibly start out large, tighten up and then begin to open up again. Keep a log so you will remember what the best load is for that bullet. Do the same with each bullet weight. You may want to measure your groups to go back later and try to duplicate.