I recently received my 28" 8 twist, 28 nosler remage barrel from X-Caliber, awesome fit and finish, took 12 weeks to get it, but I have to say that a far as I can see from inspecting it, it's about the most perfect barrel a guy could ask for. Problem is, I've tried retumbo and h50bmg, wlrm, rem 9 1/2, and F215 primers, with 180 Eld-M bullets. 2 ladder tests and about every combo of those primer and powder combos you can think of, and I'm getting high pressure and terible copper fouling even at loads far bellow the max book loads. Before anybody mentions brass, it's not an issue. I've used new brass and twice-fired brass, and I understand headspacing off the shoulder. X-Caliber dosnt list 28 nosler as one of their chamber options at the time I ordered so they had to buy a reamer and as far as I know this is the first 28 nosler they have chambered. I'm thinking my freebore is soo tight around the bullet that it's building pressure before the bullet even contacts the lands. Is there any way to fix this without sending the barrel back? Or has anybody experienced the same thing with 28 nosler? I just got done fighting with Carbonsix for a year after getting two of the most horrible barrels I've ever seen and I'm very reluctant to send a barrel back for replacement.... what do I do?