The percussion cap also solved the priming problem permanently—and in doing so, made the self-contained cartridge not just possible but inevitable.

That word "inevitable" is doing a lot of work, and it earns it. Once you remove the exposed priming charge from the equation, everything downstream — reliable ignition, weatherproofing, eventually smokeless powder — gets unlocked by that one solved problem. Next time your carry gun fires in the rain without a hiccup, that's a direct line back to a copper cap on a nipple.

Commercially, Boxer primers dominate the handloading market because a standard decapping tool can punch the spent primer straight out through the central flash hole — a process that Berdan-primed cases, with their integral anvil blocking the center, do not permit.

If you've ever grabbed a bag of surplus brass at a gun show and then sat down at the bench wondering why your decapping pin isn't cooperating, this is the sentence you needed two hours earlier. Berdan brass isn't unusable — people reload it — but it requires a different tool and a different headspace. Worth checking your brass before you buy in bulk, especially on anything imported.

The propellant deflagrates — burns rapidly — rather than detonating. This distinction matters: a detonation would destroy the firearm; deflagration produces controlled, progressive pressure rise.

This is the thing that trips people up when they start reading about pressure loads and start imagining their rifle as a pipe bomb. It's a burn, not an explosion — and the whole cartridge and chamber system is engineered around managing that burn predictably. Understanding this makes you a safer reloader and helps you make sense of why powder selection and charge weight matter so much.

For the folks who reload: have you ever worked with Berdan-primed brass and found a setup that makes it practical, or do you just sort it out of the bin and move on?

Read the full article in The Handbook → | By The Boise Gun Club Team