You might try The sportsmans wharehouse , I was in there a while back and they had several bins of "wildcat" brass that included 8mm 06'. I wasn't looking for 338. 323 is closer than 308 or 358 . Seems like a buck a case is pretty hi for a necked up 06' . Me for me I'd just neck up some annealed 06' for about .25 a case even if you buy new .