A few things.
-I have thousands of rounds of steel cased ammo through my xcr's, no problems. Wolf 55g will group to about 1.5-3 moa with the gas on. (1/7 16" hbar)
-dont know if you have gander/Cabela's/basspro but wherever you purchase always inquire about price match, I recently found out that our local gander will honor most anything online, just show'em on your phone.
Cheap Ammo For Sale | In Stock Ammunition For Sale
www.slickguns.com (use ammo section)
Right now a case of wolf is around 250.00 here, if that helps.