I’m currently shooting lever action silhouette using a 165 cast RN/FP over 13 grains of IMR4227. It is inconsistent at knocking over the 200 yard Rams. Any suggestions on a load that will do the job? I know I could go with a jacketed bullet, but would rather stay with a cast boolit. Anyone using 4227 or do I need to switch to another powder? I’m relatively new to the game. Thanks in advance for any advice.