I've got a CVA Optima Pro and I shoot 100gr of Triple7 pellets, and a 295gr Powerbelt.
So far it's dropped every deer where they stand.
I've gone back to using Remington 209 primers, however. I used the Triple7 brand primers made for muzzleloaders and had a ton of failures out of them. And nothing, and I mean NOTHING, gets my goat more than to spend the time scouting, sitting and hunting, having a nice buck come up and then have an equipment failure!