I have a set of RCBS dies for a .338-280 Improved wildcat. The dies are stamped .338 Wolfe, but the engraving on the rifle's barrel says .338 RCBS. The rifle has a tight chamber, and both .280 and .30-06 brass were difficult to chamber after the full length resizing. So, I sent the dies to RCBS and asked them to confirm the dimensions. After a dozen or so back and forth emails and a couple of telephone conversations, they admitted that the dies did not match anything in their records and that they did not have any idea what the dies were for. It took about six weeks and a couple more phone calls to get the dies back from RCBS.
Next time I drove up to Albuquerque, I dropped the rifle and dies off with my gunsmith. A week or so later, he called me and said that the chamber matched the specifications in Ken Howell's book, but the sizing die was a couple of thousandths or so oversized. He suggested that rather than try to form .280 or .30-06 brass, that I just buy new .338-06 brass from Norma or Weatherby and fire form them in my chamber--and that's what I did. Most of the first 100 cases have been fired at least a couple of times, now, and everything is working well.
Last edited by mudhen; 07/15/18.