Not saying you need one of those huge 50mm obj. scopes but the little 20mm ones just don't cut the mustard in my opinion. 30mm is as small as I go with 40mm being in the sweet spot for my old eyes. At your range expectations the Nikon 2-7x32 Prostaff with the Niplex ret. would do a fine job for you. Just put one on my .458 SOCOM and it holds zero wonderfully. I let a buddy of mine take that rig to Texas hog hunting and he is reporting outstanding results (may have to put on the boxing gloves to get me damn rifle back) with the new scope and the new Lehigh XP bullets I loaded up for it. While that objective is on the smaller side being 32mm they were night hunting with an ND3 laser designator type light fixed to the rail and he was having no problems at all.