Thanks Gentlemen, that's encouraging.
In 1990 Agents in our sector were permitted to purchase their own semi-auto to carry in lieu of the Service Revolvers after they completed Semi-Automatic Transition Training (SATT). The majority purchased Glock 17's and 19's. SATT was two days long with about 500 rounds being fired. Both digested the standard 115 grain 9mm fine, but the 19's choked badly on the duty load which was a +P+ 9mm 115 grain at ~1300 f/s which was required for qualification.
We couldn't figure out why, but all stoppages were failure to lock into battery. The NRA took some high speed photos of the 19 firing +P+ 9mm and found that the weapon did indeed lock into battery, but then bounced out. All the 19's were sent to Glock and returned in short order. After that there were no problems with the +P+.
It's also good to hear since the only sight I can now use with these older eyes is the Novak Ghost, which isn’t available for revolvers, and if I am to continue qualifying annually under Title 18 USC 926c I’ll need to be able to see the sights.