Originally Posted by 8ptbuk
I recently had my Glock 36 FTE while shooting it . I was using wwb ammo . I also had some Hornady ammo on hand also . The hornady ammo ran fine. I had probally 6 fte out of 50 rounds with the wwb . I measured the rim dia. of both brands of ammo i had and the wwb was .472 and the hornady measured .474 . My sierra reloding manual showed a 45 ACP case to measure .480 . Why all the different readings ?
Manufacturing tolerances, mainly.
I've seen similar fluctuations in many brands (just checked out some Sellier & Bellot .45 230 FMJ and saw similar variance of .472 - .475 under the maximum dimension of .480) and it is not unusual. The Hornady and WWB seem to be closely specced in regard to that dimension, being within .002" of each other.
Nothing to worry about.