I had a 12X SWFA just for varminting on my 22-250. If i was back in Central Oregon hunting chucks and yotes in lava rocks it would have been fine. The background would have made it easy to find them. But now I'm in an area that is mostly grass and it became hard to find anything. So I switched to a SWFA 10X and it seems easier to find rats and such. The fixed Leupolds might be brighter and more clear so the time proven 12X might be fine or preferable. I just found the fixed 10X to work better for me.