Les, I have a 10" 45/410. Mine is the version w/o rib, but has the regular adjustable sights. I took'm off and put on scope. Granted, I didn't try many different 45 loads, but accuracy was not enough for the scope to be any advantage, so I quickly switched it back to the open sights.
BTW Les, I'm the sucker you pawned that ol' 375Win barrel off on and I still thank you every time I shoot it. THANKS, GOOD SHOOTIN', Walt :grin: