As Walt Sherrill posted these are Robust little guns. IIRC Keltec "suggests" 115 gr standard pressure rounds - or they did back I when I rec'd mine.
Matt G is correct as well - why use a +p when a standard pressure rd will do.
-Ammo must be reliable in any firearm.
-POA/POI
If one does not have these, shot placement will not occur. Shot to shot will suffer with increased recoil.
That said...
When I was asked to T&E the P-11, [ read: tear it up] some loads were "scoop powder from cigar box and stick a bullet in it loads". I was wearing gloves, a Kevalr vest and helmet with faceshield.
Kinda glad to get back to Factory loads
J Shirley is correct as well with regard to lubrication. One popular product touts "never use grease - oil is better". Not in my testing, over a variety of firearms.
RIG +P is what I use.
Mine currently has the Win 115 gr STHP. Always feeds, shoots POA/POI, and these are left over from some 3k + rds of these I bought to use in various platforms.
Speer Gold Dot 124gr, as stated is a great load , feeds well, and has consisitent results.
Disclaimer: DO NOT "scoop powder and stick a bullet in it".
Figure of speech for some really hot handloads with Jacketed and Lead bullets tested.