I have a 12" 44 mag Encore with a Nikon 2x scope mounted. I have no problem out to 100 yards. My handload with 240 grain XTP's drops about 2" at 100.

I haven't shot the other two but think they would best out past 100. I was looking for a 300 BO and ended up getting a ported 12" 375 Winchester for my Contender. Going out tomorrow to test a few more loads in it. Really liking it so far. It wears a 2.5-7 illuminated scope.

Good luck. The weather is finally cooling down for us.