My ultra 20 currently where's a bushnell banner 1.5-4.5x32. The scope has zero 20 gauge slugs to it's credit it at this time, but that will change this fall during sight in. However, the scope came from my 22lr sportster where it saw a couple ranges days, and before that came from my mini14 where it saw a few hundred rounds of rem 223. Before that the scope handled around 50 12 gauge 2 3/4" slugs and a dozen or so rounds of 3.5" turkey loads out my 870 super mag. So the scope has proven it can hold it's cookies and POI. I have no doubt it'll be a good scope on my ultra 20.
later,
scruffy