Optima Pro Question

[bucktrack7]

Need to find an accurate load for this gun and looking for advise on things to try.

Here is my set up and what I have tried.

I am using a CVA Optima Pro .45 cal. in nickel. 100 grains of loose powder with Power Belt 265 and tried 195 grain bullets. My groups are as big as a pie plate at 50 yds. I am using a Power Aisle bench rest and at times a hydraulic trigger.
Before this weapon I was using a CVA Firebolt also in .45 cal. with the same powder and bullets as listed above and it was wonderful. That is why I thought the higher priced Optima Pro would be as good but easier to clean and handle the weather better.

Any suggestions would be great.
Thanks!!