http://www.sos.mo.gov/adrules/csr/cu...csr/3c10-7.pdf
It looks as though...
Hogs can only be taken during a "big game" season, such as deer or turkey season on
public land, and you have to have a small game license or a deer license if you haven't filled in all your tags on your deer license. Also, you can only use .22 rimfire firearms, or shotguns with #4 or smaller.
However, on qualified,
private land, they may be taken at any time with any firearm. However, I can't tell from the the regulations if that only applies to the landowner himself, or anyone that has permission.
I would think that any muzzleloading firearms or bows could be substituted for rimfire rifles, but I didn't dig for that information- I'm just going on NC and GA regulations as a precedent...which is a possible fallacy. Hogs must not be very large or tough in MO, since they can only use rimfires! We use buckshot, hard cast slugs and .300 Win Mag BAR's down here.
I'm planning on a south Georgia hunt later in the spring, and going to take my hot loaded .35 Remington Model 14 Remington. with me.