My 12 gauge Remington 870 has a red dot that is sighted in for deer slugs at 50 yards and is also accurate with the HS Strut Undertaker choke shooting lead without changing anything. Having said that, I set my decoys at least 20 yards out so as not to have to small a pattern when it reaches the gobbler. Also, by all means, on cloudless days avoid setting up so that you will be looking into the sun which will cause you all sorts of problems with aiming. My only experience with this taught me this valuable lesson. I did get the tom, but had to do lots of head bobbing to get the bead on the bird.