Double post. I missed the existing section for the 115MPR. Apologies…

Glock 17.5 w a bunch of mods.
Powder: 5.7gr MP165 from American Reloading (says to use BE86 data)
Primer: CCI500
Brass: mixed used
COAL: 1.033″
Velocity per labradar: right at 1200fps
Grouped just over 1″ for 3 shots, shot supported.

***Info only. What works in my pistol may not work in yours. Always work up your own loads.