OP
I’ve wondered the same thing .... sabot slug ok, muzzle loader ok, .44 mag denied !!
Well, to follow up on my earlier post...
The reason I figure things are essentially best left alone, is that the essential reason there ever became either shotgun only, or shotgun/muzzle loader zones, was because shotguns and muzzle loaders at that time were very limited in range and capability, both energy and accuracy wise. So they were able to make a case, for having a time set aside for those willing to put in the effort, and they were able to make a case for that they were not flinging lead at the same distances the rifle hunters were, so we're safer ( so the argument goes) to be nearer to houses.
It was only in more recent times, that guys looked at the letter of the law and found ways to turn the disadvantage that it started out as, in to essentially even footing with rifle hunters.
My personal thoughts are, that raising the issue as if it will help the shotgunners/ML set, is that it will serve only to point out the very minimum of difference in capability and range that the modern 'gamed' versions of those pursuits, have become, and if anything, all I can see coming out of it is outright closure of areas that are currently open to hunt in. For the childrens!
I kinda like what a couple of the States have done, in calling it a primitive weapons season. No scopes. No repeaters. Guys that want to shoot smokeless. muzzle loaders, or scoped, rifled sabot shotguns, get to take them out the same time as all the rifle hunters.
I find it funny too, that somehow being a straight wall case is supposed to make it all better. Like a .444 Marlin, or .458 Win Mag. As opposed to any of the black powder bottle neck cartridges, like say, .577-450, or the various other black powder era bottle neck cartridges that meet the reasoning behind the separate seasons and zones in the first place. What about a sabot in a .458 case? Still good? It's good in a shotgun, so why not there?
Mostly, I think that rattling anyone's cage to try to get 'more' has a great deal of potential to cause more harm than good.
I'd far rather see a case made for doing away with separate zones and seasons.