Dave
the 45/120 nitro is loads for modern guns, built for nitro. I do NOT recommend them in rebuilt shotguns, as, like the "for ruger" loads, they are probably going over 28l.
My max ceiling is a quickload estimate of 30k -- and h335 with a filler will do WAY over my desired loaded.. i want 400gr at 2000-2100 .. that's all .. no more, too much of a good thing, and its a pig gun, for all goodness.

I spent the day with my spartan shooting water jugs.. dang good fun!