Just for the record, my son was shooting full-house .500 loads when he was 11.
I do load 10mm (lots of it). The gun is very accurate - as you would expect from a S&W revolver. The recoil is a bit more than a .357, but very manageable.
The 10mm is a great cartridge to reload. You can get bullet weights from 135 to 220grains, and load it to low .41 Mag levels.
If you can make it to Shirley, you're welcome to shoot mine.