Oh man! This was all for nothing, and I don't know why I didn't think about this before.

I knew that if I used a muzzleloader during rifle season that a scope, sabots, and pellets were legal. Those laws only apply for the ML season, but I just thought of another law that might not be, and I just called the DOW to verify it.

One of the laws is you have to use a .45 cal for deer, and a .50 cal for elk. That doesn't change for rifle season. So, using a smaller bullet with a sabot is not legal for elk, unless I started with a .54 cal gun.

Now i'm back to square one.

Dumb law. You telling me a 300gr .45 cal bullet won't kill an elk? Sometimes Colorado is annoying.