204Ruger

Rick in Oregon wrote: ↑Wed Mar 06, 2024 11:19 am To that end, there was an excellent article in the now defunct Precision Shooting Magazine in the mid-90's that featured an extensive test of actual primer flames as seen with a high-speed camera in a dimly lit environment. All popular brands of primers were tested, and it clearly showed that the 7-1/2 primer had the strongest flame to ignite the powder column. The article also detailed the various cup thickness of each primer and all dimensions also. So if anyone has a stash of PS magazines, this article may be the very best source of answering these questions that still linger to this day.