English please!
I should add I mostly shoot 9MM ammo.
Since you shoot 9mm, I have just the numbers you are looking for!
Last weekend, I chronographed some factory ammo and some handloads. The factory Federal and Remington UMC 115 gr. FMJ were both equal to a mid-range load using Power Pistol. All handloads were using WCC brass and CCI-500 primers. Here's the data I came up with:
This first batch was all fired through a Glock 19:
Federal 115 gr. FMJ RN (WM5199)
Max: 1114
Min: 1094
Ave: 1104
ES: 20.0
SD: 6.0
(Note: See my thread
here regarding accuracy problems with this cartridge. I'm still waiting for a response from Federal.)
Remington UMC 115 gr. MC (L9MM3)
Max: 1112
Min: 1079
Ave: 1097
ES: 33.0
SD: 11.2
5.7 gr. Power Pistol, 115 gr. Winchester FMJ (Flat Base)
Max: 1112
Min: 1082
Ave: 1096
ES: 30.0
SD: 10.1
6.5 gr. Power Pistol, 115 gr. Winchester FMJ (Flat Base)
Max: 1233
Min: 1192
Ave: 1213
ES: 41.0
SD: 13.4
As an interesting side note, my chronographed velocities from the Glock 19 were almost a perfect match to the Hornady load data I was using. I do have more data for the loads between 5.7 and 6.5, but wanted to give you a brief overview.
Here's the data from the same loads in a 5" XD-9 Tactical:
Federal 115 gr. FMJ RN (WM5199)
Max: 1166
Min: 1147
Ave: 1157
ES: 19.0
SD: 4.0
(No accuracy problems with the Federal ammo in the XD-9, only with the Glock 19. Unfortunately, I didn't have enough R-P ammo on hand to test both the Glock 19 and the XD-9.)
5.7 gr. Power Pistol, 115 gr. Winchester FMJ (Flat Base)
Max: 1167
Min: 1130
Ave: 1149
ES: 37.0
SD: 9.0
6.5 gr. Power Pistol, 115 gr. Winchester FMJ (Flat Base)
Max: 1302
Min: 1256
Ave: 1276
ES: 46.0
SD: 15.6
In summary (based on my limited experience), I would say that factory ammo is almost a dead match for a mid-range handload using Power Pistol, at least in the two handguns I tested.
Hope this helps!