I have always used the 1075 caps from RWS. Well, not always always, but always like for the last 40 years. I cannot recall ever having a mis-fire when I have done my job correctly. I was not really happy when they dropped the 1055 cap, as they worked really well on revolvers.
When you bought a case of 100,000, they came packed in a neat wooden box. Made wonderful storage boxes, but they come in cardboard boxes now. Too bad. Each container of 100 came in a metal container, now they are plastic. I guess we can mark that all up as "progress". Or it might have something to do with HazMat shipping rules, not sure.
I am probably down to about 3 or 4 rolls (1,000) of caps in my inventory right now. With the amount I have been shooting the last little while, sorry to say, that is probably a life time supply.
John