I shot 3 deer last year with a 50 mm BSA Red Dot sight on my 12gauge 870 shooting Federal slugs. 3 shots .. 3 deer. Longest shot was 120 yards shortest was 40. I think the dot size is 3 moa

A word of advice to any hunter considering using them though, there was a good amount of snow on the ground and on the first day when the sun popped out and I looked through the scope I freaked. It was so bright my dot was washed out on any light covered background. I changed the battery thinking it must have died, but it was just because it was so bright. In mornings and evenings or cloudy days it worked awesome, but with snow on a real bright day I don' t care how bright you crank it up to (mine has 12 settings) it won' t be bright enough to see on a light background, you' ll only see it if it is covering something dark like tree trunk or deer and even then it will be faint.

To be fair it was only a problem when I set up on a field edge during the brightest part of the day, back in the woods even when it was bright it was noticably sharper.