You have the winning combo there. The best jacketed bullet in the 444 and the right powder. I always had lever guns in 444 so always ran decent crimp, but might not need to in your cva, try without a crimp but if you are getting un-burnt powder or accuracy is not what you would like it to be start with a light crimp and see if it helps. You can also play with seating depth more if not crimping as you do not have to worry about cannelure.