Yeah, the 209 primers make for a good pop. I reload shotshells, and if a crimp fails, you have to fire the primer prior to extracting it.
Cheap too. $4/100 if you buy in a 1,000. $6-8 if you buy per 100.
I have to present my PAL when purchasing Primers.
I know the rare and obscure "Teufelhorne" Regiment handsignal.