Hey Roadtrip,
Here is what is found in the Utah Proclamation on Muzzleloaders.
The website is
http://www.wildlife.utah.gov/proclamations/2004_biggame
and you can find this info under the General Regs,Section VII.
(1) A muzzleloader may be used during any big game hunt, except an archery hunt, provided the muzzleloader:
(a) can be loaded only from the muzzle;
(b) has open sights, peep sights, or a fixed non-magnifying 1x scope;
(c) has a single barrel;
(d) has a minimum barrel length of 18 inches;
(e) is capable of being fired only once without reloading;
(f) powder and bullet, or powder, sabot and bullet are not bonded together as one unit for loading; and
(g) is loaded with black powder or black powder substitute, which must not contain nitrocellulose based smokeless powder.
(2)(a) A lead or expanding bullet or projectile of at least 40 caliber must be used to hunt big game.
(b) A 170 grain or heavier bullet, including sabots, must be used for taking deer and pronghorn.
(c) A 210 grain or heavier bullet must be used for taking elk, moose, bison, bighorn sheep and Rocky Mountain goat, except sabot bullets used for taking these species must be a minimum of 240 grains.
Hope this helps. What units are you looking at?
Good Luck!
a*r