Just a quick question on yalls loads for your P10s. What Bullet & weight, along with powder.
Coleman, we haven't had a lot of extensive P-10C load development posts in this subforum, for whatever the reason -- I just suspect the guys who are super-active in this subforum who do a lot of testing with a variety of bullets don't have a P-10C yet. That would describe me. So I'll produce a lot of data in this regard some day, but not yet.
You're in luck anyway, however, because...
If the powder is accurate in 9mm, you'll be able to work up an accurate load with the P-10C. If the bullet is good in 9mm
CZ pistols, it's going to produce an accurate load with the P-10C.
Quite simply, if accuracy were my ONLY concern, and it were not a 9mm minor action pistol competition load where there are other considerations, so just accuracy, I'd load a 115gr JHP, with the 115gr Hornady HAP being my first choice, and I would load it with a slower burn rate powder like Silhouette, Power Pistol, or AA7, and I'd drive it up somewhere around 1200-1240 feet/sec.
The fact you are loading with N320 and 124gr bullets makes me wonder if you may also be loading for 9mm minor action pistol. If that's the case, just say so, because my recommendations for that would be entirely different.