Bingo! I'm not even sure you need to shoot it. Just pick the one that feels best and don't over think it. Personally I like the small one best, but each person is different and that's why they gave us 3 options.
I respectfully disagree. He NEEDS to shoot it. The small and medium felt perfect in my hand while at home dry firing. Then at the range it was a whole different story with my 40c.