Goldmark's percussion caps - Sizes?

[CPC]

I picked up a couple of sleeves of percussion caps at a yard sale today and was wondering what the size or no. 13 caps were used for? Shotguns.. ? mostly I've used 10 and 11's but never used a 13 for anything? Any help would be appreciated.

Regards,
CC

[JBinIll]

It's slightly bigger than a 12-

http://i1154.photobucket.com/albums/p529/OldGussie/Scan4-1.jpeg


If you had a slightly mushroomed nipple or a nipple a 12 was a little bit too small on a 13 cap could be used.

Those are not as old as you might think,Olin Corporation bought WRA out in 1931.If you want to sell one or both PM me.