I've been using the Stoney Point OAL gauge and comparators for years, both with the straight version and the "L"-shaped bent unit that works for semi-autos like the Garand.
I was reading the gear review on this site, and was amazed to see how, with an extra comparator, you can use this to sort bullets by bearing surface length:
My first reaction was "now why didn't I think of that?" Anyway, it's a nice review with some other tips,such as using a dowel to poke out stuck bullets) that you won't find in the instructions.
Link: Stoney Point Gear Review
I was reading the gear review on this site, and was amazed to see how, with an extra comparator, you can use this to sort bullets by bearing surface length:

My first reaction was "now why didn't I think of that?" Anyway, it's a nice review with some other tips,such as using a dowel to poke out stuck bullets) that you won't find in the instructions.
Link: Stoney Point Gear Review