at the range last night i had 4 of 6 alum CCI 357MAG blow out, only the last shot gave any indication that any thing was wrong there was a big flash and all of the hair burned off my hand.after the smoke cleared it was very hard to eject them,i could not reload it so this morning i took it to Curry Thomas he inspected it clean the burned power and alum out we ran 50 federal 357 out of it my 686 works fine again .