Rick R & RJM52,
Your post + the collective info from others convinces me that my original thought on the 124gr. to be the way to go.
A friend has a 6 cav. Lee 120TC that he has offered to loan me......it'll allow me to find out if my Ruger likes the TC shape. If so I think I'll go with the Arsenal 124TC (unless the 120TC Lee wins me over).
I slugged the bbl. today & was somewhat surprised: The 3 measurements (with a micrometer)were .35540, .35540 & .35550. I had been under the impression that most of the Ruger 9s were .357. Maybe Lathesmith can come up with a .35650 or a tight .357.
I also weighed the trigger pull: it'd hold a 4.5, but not a 4.75. I disassembled & very very lightly polished the trigger stirrup (no engagement surfaces) with 1500 (worn out) paper. I also did the same to the paddle surface of the disconnector. This improved the smoothness somewhat & will now hold 4.25 but not 4.5. A slight creep remains (better than before) & I suspect the channel in the frame for the trigger stirrup. I'll just shoot it a while to see if it improves or at least develop some rub evidence.
Henry