RE: need some help
You will find better accuracy with 100 grains, better control, less flinching, and just a much more pleasant range session. The XTP is not a high speed projectile anyway. I shoot them with as little as 80 grains of powder with excellent accuracy, and as much as 120 grains of loose powder.
Be sure to swab the barrel between shots, and I think you will find they shoot real well. I have a CVA Staghorn Magnum which the Buckhorn Magnum replaced. 90 grains of loose powder is the magic number for it. So 100 grains of pellets I will guess is the magic number for your rifle.
If you ever see some 250 grain Shockwaves, give them a try. Again with 100 grains of powder. Actually the CVA shoots a lot of projectiles excellent. And my Staghorn has an excellent trigger to boot..
Good luck at the range. We will be waiting for your results and impressions of the experience.