This^^
OP, The regulation was likely written well before ARs even existed as well as there is nothing stopping anyone from using an AR in a caliber that is larger than .23. If you think it should be changed why don't you just call CPW and ask them what the procedure would be to get it changed? The regularly review all hunting issues and make adjustments when needed.
As for boars, they are categorized as a varmint or non game animal, the state apparently doesn't care so much about how they are taken as long as they are taken.