I am looking for a load for a 265 gr Cast performance Tech bullet that will push it about 1200-1300 fps out of a 4 5/8 Blackhawk. I have H110, 2400 and Accurate #9. Ditto for a 275 gr 44 mag out of 5.5 Redhawk. Besides a good crimp any other precautions? This is my first attempt at reloading hard cast lead.