I am planning on reloading for my .44 Remington Mag. Ruger Blackhawk new model. Can I substitute CCI 300 large pistol primer for Remington 2 1/2 large pistol primer? Also I have info on using soft point bullets but not flat point. What do I need to do to use flat point bullets? Plan to use ~23 grains IMR4227. I really appreciate any info.