I cast a 525 grain conical in 50 caliber for elk. I have used this bullet in CO. But I am not 100% sure the bullet is legal. CO has some weird law about diameter versus overall length. So be careful.

I did have a CO-conservation officer check our licenses once in CO. But he did not look at or even ask about our projectiles. All he was concerned about was a hunters safety card, and our tags. Tom.