First up was the 180gr FMJ load from Sellier & Bellot.
LO: 1088So, basically your typical 10mm commercial ball ammo: Hotter than .40S&W, but nothing to shake your fillings loose.
The numbers from the Sig Sauer Elite Performance 180gr FMJ were as much spicier as the felt recoil would indicate:
LO: 1172Most of a hundred feet per second faster than the S&B, and you don't stand around wondering if the gun went off, either. I'll note that this pretty well echoes the numbers of the 180gr V-crown JHP offering from Sig, making it a legit practice load, and it's priced pretty aggressively, too.
This makes 530 rounds since the Glock 20 was cleaned or lubricated, with two failure to feed (#401, #454). 1470 rounds to go.