ThisH&R 20 gauge Ultra slugis a verybarrel heavygun tolug around the woods, so I opted to mount a short Simmons 4X32 shotgun scope with an extra2 inchesofeye relief andthe Truplex reticle. It's very clear and bright and4Xisa fine all purpose power.
I'd definitely recommend to stick with a shorter, lightershotgun scopeto help keep the hammer clear while stillallowing forlow mounting andless weight. But you'llneed the extra eye relief.The hammer extension just barely touchesthe rear scope cap, and there's about 1/2+ inch of clearancewith the cover off andwithout anyinterference. The low Millet ringscouldbe alittle bit higherdepending on one'spreference.
The shots will group touching justthe same asif it werea much more expensive scope. Ihavethe identicaltwinscope on my Remington Pump slug gun,and I liked it so much thatI bought another.The cost wasin the$60 rangeIIRC.