I just had pac-nor make me a 6mm/250 as well. I went the sporter route - mine is 23" matte SS in a 700 "mountain rifle" contour, 1-9" twist, 700 SA. Anyway, it is freakishly accurate. So far I've tried the 90 and 95 Nosler BT and the 100 gr Rem PSPCL. Mostly with Re15 and moderate loads and CCI 200 primers. It likes the 90 gr the best - usually 0.5 MOA or so. I actually have 3-4 of these thin little barrels from pac-nor, and they all shoot amazingly well. I'm going to give Re19 and H414 a try, though I doubt I'll be able to one-up Re15 for accuracy. Oh, I use necked up Rem 22-250 brass, neck-sizing only. Anyway, good luck.

Check out the Glen Zediker website. The 6mm/250 is essentially the same as the 6mmXC that David Tubb developed for match rifle shooting. David Tubb's company (Superior Shooting Systems) sells 6mmXC brass. It's made by Lapua.
JCN