Unfortunately, that is not an option in Colorado. You have to use a solid conical. No sabots allowed. I have not found any bullets that meet your criteria and meet Colorado's too.

I will be using the 405 aerotip powerbelt for my elk hunt this year with 95 grains of 777. My brother is using the 348 aerotip with 110 grains 777.

From what I am hearing, I am beginning to believe that you can possibly load too heavy for these kinds of bullets. In other words, I have heard of more failures of powerbelts at 150 grain loads than 100 grains of powder. Maybe these soft lead projectiles penetrate better and don't blow up as easy at lower velocities. Kind of like soft lead bullets fired from a high velocity rifle at close range that blow up on impact. Anyone else heard of this being the case. Anyway, I am confident in my load of 90 grains of 777. This is equivalent to 110 grains of black powder/pyrodex and has plenty of power to kill an elk out to 100 yards, my max range with open sights.