Here it is as defined for use in ML seasons:
In-lines ok
Min cal for deer, antelope, bear is .40. The minimum projectile weight is for .40 cal to .50 cal is 170 grains. (this eliminates round balls in any rifle under .50 caliber)
Min cal for elk, moose is .50, min projectile weight is 170 grains. For rifles over .50 cal, min projectile weight is 210 grains.
Conical bullets or slugs may not be longer than two times the caliber of the rifle.
No pellets
No scopes
No sabots
Hope that helps