Pglasgow
Here you go un-paraphrased... Big 6X6 wrote this I think he is a more than fair person and very knowledgable... just my thoughts
I have to admit but I've owned a total of four, two .45s and two .50s. The first I bought was a .45. It wouldn't shoot. I mean it wouldn't shoot an 8 inch group at 100yds! I sent it back and they sent me another. Same results if not worse. I tried 225gr/275gr Powderbelts, 200gr SSTs/XTPs, 195gr Barnes Expander...90-100gr Triple Se7en. No luck. Sent it back...they replaced IT with a .50cal Apex. No luck, same results. We're taking 8-10 inch groups here. Replaced IT with another .50cal and I sold it without shooting it for $225.00 NIB, lost my BUTT but was glad to get it! It's too bad because it was one great looking rifle, good sights(I mounted a scope of course), and a really nice stock.
Okay there's my story...I HAVE heard of a few that did shoot. Do you have a scope mounted? Everything good there? I too would start out with some XTPs or Shockwaves. Start with the 250gr .452 XTP or 250gr Shockwave and use 90-100gr ffg Triple Se7en OR two pellets, Pyrodex or Triple Se7en. If THAT doesn't group try 200gr Shockwaves with the same charge. In my experience if it doesn't group with that, it probably won't group. Be sure and spit-patch between shots and don't get your barrel TOO hot.
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Chuck