If you are shooting the T/C Shockwaves and are having accuracy problems keep in mind that the 250 grain bullets come with two different types of sabot and that the sabot could be the problem. I was shooting my Encore and wasn't satisfied with the accuracy and was shooting the 250 grain bullet with the "yellow" sabot, then I tried the same load with the 250 grain bullet with the "black" sabot and I cut my 2 1/2 inch group down to 1 1/4 inch by changing only the sabot. Hope this helps...

PS: my load for my T/C Encore .50 cal is 3x50 Pyrodex pellets, 250 grain T/C Shockwave "black" sabot and my primer is the VariFlame system using Federal small rifle primes. I'm consistently shooting between 1 and 1 1/4 inch at 100 yards. This load also took my cow elk at 52 yards and I recovered the bullet on the off side shoulder.