I have tried this and found it to be 100 percent reliable ignition when used in black powder cartridges, both rifle and handgun. The cartridges I used them in are: Handgun -> .32 S&W, .32 Colt New Police, .38 S&W, .45 Colt, Rifle -> .38-55, 11x60R Mauser, .45-70. I loaded 20 of each. I fired...