You are loading for a 250 yard rifle, max, so don't over complicate it.. You do not want to lock up a lever gun, REALLY a pain in the rump to fix. Trajectory at 2000 or 2300 FPS isn't going to change much and wind drift is a non issue usually. Crimp your bullets so they stay put, use CCI 250 primers for load development, start at min, go up .5 in 3 round test batches. When you hit max published velocity STOP, also if you hit a velocity plateau where more powder keeps vel the same or it decreases, even if you are far from max charge. When you get to max book charge or any signs of pressure whatever, also stop, whichever occurs first. Best of luck.