.22 CB
The . 22 CB cap ( conical breech cap ) is a more powerful version of the . 22 BB cap ( aka: 6mm Flobert ) rimfire metallic cartridge , which was invented by Louis-Nicolas Flobert in 1845 . 
<triplet> .22 CB <subj> .22 BB <obj> based on <triplet> .22 BB <subj> 1845 <obj> inception