Phil - I had the same concerns afew years back and called the D.O.W. office in Denver. All forms of muzzleloading bullets and powders appear to be legal during the rifle season - pellets, sabots, scopes, more than 2X diameter, etc. - as long as it is something that is not prohibited in the "legal hunting methods - centerfire rifle" section. Like non expanding bullets.

One thing thatI alsoasked was whether the .50 minimum for elk still applied when shooting a .50 caliber sabot where the actual bullet diameter was .452. They said that was also OK during the rifle season.