Shotgun adapters?

[bdg848]

Does anyone have any experience with, Specifically, the Chaszel shotgun adapters? They make 18 and 24 inch barrel adapters to shoot various handgun/rifle rounds out of break action shotguns. I've seen a video of a guy smoking clay pigeons at 60 yards and even picking off some of the left over broken bits. That's pretty good. Specifically, though, I want to know how they would do at 150-200 yards. Would they be 'minute of deer'? I have a strong desire for an o/u double rifle in 45-70 but I can't find such a thing and couldn't afford it anyway. An over under shotgun with a couple of these adapters and a vent rib mounted micro red dot sight would be a pretty fun deer gun if it groups okay, like 6" groups. (I'm aware the second barrel wouldn't be regulated to the first, that's fine, It'd be for close up follow ups and just fun, too). I havn't been able to find much. Anyone have experience?