As stated, you can not use sabots in Colorado.

The Maxiballs, maxihunters are good choices, as would be powerbelt bullets.

You might try 245 or 295 powerbelts. They are easier to load, you don't have to mess with lubed bullets and they should fly straight if you have the time to work up a load.

I would also recommend using triple 7 powder.

Where are you going to hunt?