Without measuring bullets and doing the math ... either will stabilize 124g and "shorter" (weight of bullet is commonly used as substitute for length; length of bullet is what stabilizes it). I enjoy shooting 147s - I'll keep my 1:10s.
This can be estimated mathmatecally and I'm making a guess. If you need the math - I can deliver it later.
The real answer would need to come from bullet manufacturers that have conducted tests. My personal opinion is that slight differences would not be noticeable by us average plinkers. I'm also guessing that hunters using pistols for longer ranges (50 to 100 yds.) might be affected by differences in twist. Just my best guess.
Don't forget to factor in bullet speed. For example, +P+ 124 grain 9mm would probably stabilize better with 1-16 rifling, and a 147 grain loaded light, as in target ammo might benefit more from a faster twist rate. In the end though, at normal shooting distances generally seen with pistol shooting (3-25 yards, with the vast majority done at 7-10 yards) I doubt accuracy differences would be noticeable. You get more accuracy variance when you shoot cheap target ammo like WWB.
Absolutely! And even those differences (if the shooter does the right things) would still be well within "minute of thug"!
I have a 5" CORE 9mm, and can attest to the extreme accuracy the Storm Lake barrel provides. The barrel is stainless with threads. I can shoot this gun more accurately than my Sigs, which are very accurate. The barrel did take 12 weeks to receive. It feeds personal defense ammo flawlessly.