405wcf-
Consider a bolt rifle chambered in 450 Bushmaster. The cartridge is OK under the new MI regulations. I've corresponded with several hunters in lower MI that have set up bolt rifles for the cartridge.
The 450B in a bolt rifle will take loads equal to the 460S&W. The data and factory 450B loads are set at a max of 39,500 psi. The factory loads are just fine, with 250 grains at about 2250 fps from a 20-inch bbl. The bolt rifle can go considerably higher.
I chambered a 1903 Springfield in 450B in 2008, and its worked well. In the 2014 hog hunt thread there's a photo of my pig whacked with a Barnes 200-grain FTX at 2750 fps.
Here's the rifle.
.
.
The rebarreling and chambering is pretty straightforward. The case head fits the bolt well. The Springfield holds one in the chamber and three in the magazine. Feeding is without problems if the bolt is operated smartly.
A short action bolt rifle should work fine.
Indiana adopted similar cartridge regulations about a year before Michigan, and several smiths there are chambering bolt rifles in 450B. Some are very well done and are priced accordingly:
http://bohmanarms.com/thumper/Some smiths in New Zealand are using the cartridge also, some of them in suppressed rifles:
.
.
--Bob