Homerboy
Member
If the problem is that the slide is not moving fast enough to eject the round, you may have issues caused by multiple sources of friction. As has already been mentioned, you may have excessive friction between the cartridge and the firing chamber. Brass shell cases expand after firing. Are you absolutely sure that the shell case OD is within spec when you reload?
The recoil spring will weaken with use, so a new recoil spring needs to be stronger than necessary so that it will have a sufficiently long lifespan. You can try to weaken the spring a bit, or increase the powder load.
If the malfunction occurs more often when the magazine is fully loaded, I'd first look for sources of friction such as such as the stripper rail. Polishing the stripper rail on my P365 made a huge improvement. The slide rails may be adding excessive friction and more break-in time may be necessary. The disconnector on my P365 first needs to overcome the trigger spring force as it moves up the ramp on the slide and then it adds drag as the slide moves rearward over the disconnector. Again, more break-in time would help.
Also, make sure that the extractor is moving freely. As it is still new, who knows how much manufacturing crud there could be around the extractor? Solvent cleaning and relubing couldn't hurt. Make sure that there is still sufficient spring pressure on the extractor. You could even have an out of spec extractor spring.
As this is a new gun you can't overlook any possibility. Having worked in manufacturing most of my career I can honestly say that if there is a way for an assembler to screw up an assembly, they will find a way to do it.
I'm going to strip the slide and make sure there’s nothing in the internals that can gun it up, and up the powder a bit.
As for cases being in spec, I’m no engineer. I’ve made thousands of these rounds and never an issue. I use a case gauge before they go into the ammo bin and they all pass.