Another advantage of the 30 mm scope is it would mount closer to barrel CL.
I agree lower mounts reduce the necessary hold over at close range but I would play some with a trajectory calculator if you haven't already to see how much difference it actually makes.
So can no one comment on the "useable" DOF differences between two scope in these two size ranges?That's what I'm asking about.
Here might be a good option I have some of their older style that just had rails for added sights etc.https://www.opticsplanet.com/ncstar-gen3-uss-3-9x40mm-p4-sniper-riflescope-w-red-micro-dot-optic.html
One more time, read this, my post #6, I think it DOES answer you.Generally speaking, the higher the magnification, the shallower the DOF. I don't believe there will be much difference between 10 and 12 power. However, the 10 X 30 will have a 3 mm exit pupil. The 12 X 50 will have a 4.17 mm exit pupil. The 12 X 50 will have a MUCH brighter view at dawn and dusk than the 10 x 30.
Can you give us the specific scopes you are considering? Also the specific range you will be focusing at? Help us out please.