RE: 10x or 12x scope for deer hunting?
I agree with TerryM. I only use 1.5 X 4 powers for deer. In the areas I hunt 25 yard shots are more common than than 200 yards. If you hunt over large fields only than maybe more power, but even 4 power is good to 400 yards with a steady rest on a still deer(with the proper round).
Good Luck