http://www.precisiondeltasales.com/
A quick look at the prec delta site shows they offer jacketed bullets cheaper than X-treme plated in the same weight, 40 165. $98.00 as compared to $111.00 for X-treme.
I've always been told that rainier has the thinnest plating, berry's has the next thickest, and X-treme has the thickest. Now, X-treme used to be called west coast bullets. They sold out to the guy that makes the aero-tip muzzleloader bullets, he wanted a cheaper place to get them plated. Apparently he wanted to move the operation, Red at west coast said to heck with that, bought it back and re-named it X-treme.
Another thing to consider. Rainier simply plated the bare lead core, no sizing. Berry's plated and then sizes certain bullets in their line. X-treme sizes them all after plating, calling them double struck.