Jeffin TD, A couple of things to keep in mind when shooting CAS. First is that it may take a bit of experimenting with different loads and bullets to find works best for your guns. Every gun is different even if they are the same make and model. Second, don't get overly obsesed on getting a really tight group at 25 yards. CAS is a game of speed and finesse. You are shooting targets that are 18 x 18 inches from 3 to seven yards at most. Your wins or losses will come more from time lost in transitioning from one gun to another and your techniques than an occasional missed target. Now not missing the targets is important but when it comes down to your guns accuracy, at these distances, its been said that if you could figure out how to load and fire a flintlock as fast as a single action pistol, you could most likely win your share of matches anyway.
I'm at this time being mentored by some of the best shooters in the business. They all have won there share of state, regional and world championships and all agree on one thing. The more dry firing you do at home, the more you practice your gun handling in and out of the holsters and switching from one to another, the more you practice moving your eyes first to the next target and letting your gun follow, the better you will be CAS. Keep in mind, punching a hole in a paper target at 600 yards is about accuracy. CAS is all about speed and finesse. Start slow, hit your targets, with lots of dry firing and practice at home, your speed will pick up.
Here's wishing you the best of luck in what has to be the most fun you will ever have with your clothes on. Keep us posted on how the progress goes. Sincerely, Will Lynchem.