I SHOOT THE KLEENBORE PRIMERS IN MY CVA BEARTOOTH
MAGNUM. WHICH IS A BREAK-OPEN DESIGN, I'VE PROBABLY
RUN CLOSE TO 150 ROUNDS USING 2-50GR. 777 PELLETS.
I FIND THEY PERFORM AS ADVERTISED, PERFECT IGNITION,
EVERY TIME WITH NO CRUD RING, EASY CLEAN-UP. I
THINK AS SOME OTHERS HAVE MENTIONED MAKE SURE
WHEN YOU CLOSE THE BREACH YOU HAVE A VERY TIGHT
FIT. JUST MY OPNION.