[Brian Pfleuger]

In my experience, which includes about 6 slug guns and a dozen or so different slugs, pretty much any shotgun with ALMOST any slug is good to 100 yards. Certain guns and certain slugs will extend that range MAYBE 50 yards farther but certain slugs in certain guns will DECREASE that range by 40 yards or more.

We have tested smooth-bore gun and rifles barrels, numerous brands of both sabot and rifled slugs. If you know your drop then you should be fine out to 100. Some slugs get weird before 100, like Winchester XP3s which sucked beyond 60 yards or so in both guns we tried.

Short story, no way to know unless you try.... and with a shotgun "try" means a good solid, recoil absorbing rest like a Caldwell Lead Sled.