A year or so ago I went looking for the minimum requirements for muzzleloading smoothbores vis-a-vis turkeys in a bunch of different states that I thought that I might one day get to hunt in.
Like I posted above, some states were very clear & concise about what was legal for hunting turkey.
Others were very clear about centerfire shotguns, but vague as can be on what was legal for muzzleloading, kinda leaving you to judge for yourself whether the regs for centerfire applied to muzzleloaders.
Other states didn't even mention muzzleloaders when it came to turkey hunting, just leaving the hunter in limbo.
And, finally, the last couple of states placed no restrictions on what bore diameter could be used when shooting a muzzleloader during turkey hunting season.
Some allowed muzzleloading rifles to be used, as well as smoothbores.