I posted this on The High Road forum just a little while ago in response to a question about cap sizes; it's reposted here for information:
Big surprise here - not the results I expected.
I measured inside diameter at the lip and overall length (height?) of each of 20 CCI No. 10, CCI No. 11 and Remington No. 11 percussion caps. I couldn't find my Remington No. 10 caps.
The CCI No. 10's averaged 0.158 in diameter and 0.162 in height; the spread was between 0.157 and 0.158 in diameter, and the heights were all 0.162.
The CCI No. 11's averaged 0.162 in diameter and 0.162 in height; the spread was between 0.162 and 0.163 in diameter and again, the heights were all 0.162.
The Remington No. 11's averaged 0.162 in diameter and 0.147 in height; the spread was between 0.162 and 0.164 in diameter and between 0.145 and 0.149 in height.
So, the CCI and Remington No. 11 caps are the same diameter on average, although the variance in size is greater for the Remingtons. That is a surprise, as I had the impression from range reports that the Remingtons were a bit smaller in diameter; they seem to fit where CCI No. 11's were too large and CCI No. 10's were too small.
The difference in height may explain why the Remingtons seem to fit better on the in-between size nipples. They may seat on the nipple sooner than the taller CCI's and thus appear to fit better.
Big surprise here - not the results I expected.
I measured inside diameter at the lip and overall length (height?) of each of 20 CCI No. 10, CCI No. 11 and Remington No. 11 percussion caps. I couldn't find my Remington No. 10 caps.
The CCI No. 10's averaged 0.158 in diameter and 0.162 in height; the spread was between 0.157 and 0.158 in diameter, and the heights were all 0.162.
The CCI No. 11's averaged 0.162 in diameter and 0.162 in height; the spread was between 0.162 and 0.163 in diameter and again, the heights were all 0.162.
The Remington No. 11's averaged 0.162 in diameter and 0.147 in height; the spread was between 0.162 and 0.164 in diameter and between 0.145 and 0.149 in height.
So, the CCI and Remington No. 11 caps are the same diameter on average, although the variance in size is greater for the Remingtons. That is a surprise, as I had the impression from range reports that the Remingtons were a bit smaller in diameter; they seem to fit where CCI No. 11's were too large and CCI No. 10's were too small.
The difference in height may explain why the Remingtons seem to fit better on the in-between size nipples. They may seat on the nipple sooner than the taller CCI's and thus appear to fit better.