ClemBert. What gets confusing is that CCI #10 and #11 are the same height and #10 on most of the pistol nipples will be too tight while #11 which is larger with CCI will be too loose. With the Remingtons the #10 has a larger mouth opening but is longer than the #11. The nipples are tapered cones and how far up the nipple the cap goes determines fit. I find that the #10 Remingtons fit the best on most pistol nipples.
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