I put a 6-24x50 viper pst ffp scope on my gun and as such, planned to put another sighting system on. Ive heard it's hard to keep 45s aligned correctly, but a top mount reflex or something similar will work well. Only use is deer hunting.which I tend to be close pretty often during drives. Can I use 6x? Yes, I've shot many many deer like that, but it's just a bit more of a pain and I have more problems getting a shot. I used a gun I was very comfortable with though and I could raise up with the cross hairs already centered on target. I usually have a harder time at shots <25 yds