No telling how the bbls will each be targeting slugs from using a single sight (front bead only?) on the gun.
It may be plenty accurate with each bbl printing a slug from each into a 8in circle at 40 or 50yrds,,something like that.
Good enough for deer and many people used to use their SxS's around here when it was rifled slug only for whitetail..
Used to be many Stevens 311's in the field loaded with slugs on opening day.
But some of the SxS's just simply don't have bbls that are regulated anywhere near what might be acceptable for your needs with a slug load.
Only a trip to the range and a few paper targets will tell.
Different slug loads, different brands and weights will print differently so don't immediately give up on one try.
Even with FULL choke(S) the standard rifled slug was good to go thru it as it is small enough in dia to slip thru it.
Some of the other specialty slug loads around now, sabots, ect may be different,,read the ammo box carefully. Even the older Brenneke slugs used to say not for use in Full choke if I'm not mistaken.
The M24 is a stout shotgun. The bbl's and ribs are actually arc welded together unlike the standard process of soft soldering the bbl's together with spacers betw and then soldering the top and bottom rib.
You should be able to still see some of the automated welds done during production under the forend when removed from the bbl's.
Winchester was on it's way to quicker, faster production methods then...
The ejectors are rather narrow and weak s opposed to what they appear on most any other SxS. But they work OK. The gun is full of coil springs and stamped parts. It's bulky and not the svelte slender thing the traditionalists look for in a SxS.
But they work,, have brought down a lot of game and continue to do so.