In the past, after much trial and error, I gave up on a 10mm field pistol that would feed heavy field loads reliably. On account of its reliability, the USP FS with .45 Super loads was what I settled on. As I became an almost full time optics shooter, I recently moved to the Glock 23 MOS and ultimately a G19 with an Acro and Underwood penetrator ammo for field use.
I am aware that Clusterfrack got a Glock 20 running reliably for him with hand loads and some equipment mods to the pistol. With the release of the Gen 5 Glock 20 MOS and the FN 510, I decided to try both pistols with heavy field loads and see if they run reliably in more or less stock form. I ordered in 250 rounds of Underwood coated hard cast and their load with the Lehigh penetrator bullet.
Assuming both pistols arrive at the LGS, I hope to begin testing soon.