Looking at a reflex or red-dot sight for my 45-70 (main use of hunting)and wondering what the practical differences/advantages are between the "scope" style red-dot sights verses the "open style" sights. By "scope" style, I mean those with a full tube and "open style" I mean those with a single lens of glass mounted at a slight angle in an aluminum housing.
Based on Zee's experiences/recommendation, I put a vortex venom (open style) with manual/automatic 3moa dot on my friends glock. In auto mode it is always too bright, but on manual mode you can turn it down so the bloom disappears and the dot shrinks to 3 moa and it seemed to shoot quite well. I was shooting it at 175 yard steel and surprised how easy it was to a acquire and hold a (rather) precise target with the 3moa dot. It made me think that 150 yard hunting with a red-dot was realistic.
This would be for hunting and pre-season practice with shots ranging from 20-100 (maybe 150, but unlikely) yards on deer or larger game in a mix of open and wooded land from a stand with a rest of sorts. I've been using leupold 2.5-8 which works well, but it is difficult to acquire the deer in when shooting across a field into a wooded north facing hillside.