I mucked around with that for a while, it got expensive, then I bought a Beretta 471 silver Hawk that was factory regulated and wish I had simply done that from the start.
It puts 4 slugs into 4" at 50m,i wish I had just gone that way to begin with, it has a blade front sight, but I wish it was a bead as it had me shooting very low with shot. I've spent a fair bit time now shooting 5 stand with it and I've finally gotten my eye in with it.
But that really was a, struggle with me as the blade keeps making you want to aim like a rifle rather then like a shotgun.

Bloody love that gun now, can't wait to take it after pigs but it's already claimed a few deer and foxes.
So it's working how I hoped it would, and it's a damn brilliant gun. 👍

I use factory slugs, home rolled slugs and round ball in it.