Will, that is very strange. CCI caps have for many years been both smaller per size, and shorter than Remingtons. In fact, Remingtons have recently been revised to being even longer than they were, causing them to no longer fit some cappers. Any nipple a Remington #10 is a slip fit on, a CCI is a hard press fit. If a Remington # 10 was too tight and #11 was too loose, a CCI #11 would fit right. Unless CCI or Remington has recently changed all their sizing, or mispackaged the caps, I am at a loss to explain your fit.