Ive read the 2015 hunting digest pamphlet cover to cover and i see no caliber restriction for MLs. Its 35cal for centerfires. http://www.michigan.gov/documents/dn...t_461177_7.pdf

Since you are on the michigan-sportsmans forum, maybe you can ask there. Busta is a member there too and he should know for sure. I know he uses a 45cal H&R and a CVA pistol with 50x40 sabots.