I have a P226 (9mm, approx 25,000 rounds through it) that I shoot in USPSA Production division using factory ammo (Yes - I need to buy a reloader, etc, etc, etc - can't do it right now).
I recently chrono'd some factory ammo and came up with sub-minor power factors:
Remington UMC 115 gr - PF = 118
Remington UMC 124 gr - PF = 124
Winchester 115 FMJ (WWB) - PF = 123
Using a ProChrono Digital - tried closer & farther to chrono, high & low in screen, etc. with minimal change in results (+/- 1 PF).
Power Factor standard deviation for all around 2.0.
From what I understand of the PF history, it was roughly based on factory ammo (or happened to be similar). Know a lot of people shooting WWB with no issues.
I have heard that Sig barrels are "slow", but not sure how or why. If so, what is the remedy (without buying a new gun)?
Anyone have similar experience, data, comments or suggestions?