I switched to Thor MZ bullets in 2017. They don't use a sabot and are legal in CO. I killed a cow elk with them and they performed great. I have taken several deer with them as well.This morning I shot a whitetail her in my home state of IN. I included pictures of how the bullet performed. 250 gr Thor 87yds obviously expanded. I recovered them from a elk and a buck and it was a perfect flower pedal expansion.