The steel case Monarch 54r ammo is berdan primed,some of the brass case Monarch ammo is made in Serbia mainly by Prvi Partizan who also make Wolf Gold line ammo those rds. will be boxer primed and reloadable.
As of today Cabelas is selling two brands of 54r ammo online Prvi Partizan and Herter's The Herter's is repackaged steel case Russian ammo and it's berdan primed as well. The Prvi ammo is brass case boxer primed and reloadable,the price on the Prvi SP ammo didn't appear to be all that great compared to some other online retailers.
In case anyone needs any Prvi boxer primed brass Graf & Sons just got in a shipment it $48 per 100 they haven't had in for over a year. I bought a couple hundred pieces several years ago so I'm good for awhile.