You might want to try some Bull Shop conicals, No Excuses Conicals, Powerbelts, it all depends on the brand of rifle you are shooting. Often the slip fit Bull Shop do real well.
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
I used a 460g Bullshop for my elk hunt this year in CO and it performed beautifully. I highly recommend them.
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"Yes, well, I’m polymerized tree sap and you’re an inorganic adhesive, so whatever verbal projectile you launch in my direction is reflected off of me, returns to its original trajectory and adheres to you." - Sheldon Cooper
I switched to the new Hornady FPB conical and had great luck on elk with them. However, with the plastic tip in place, they are too long to be legal for Colorado. So I cut them off flush with the front end of the metal and they still fly great and are legal! 3 inch groups at 100 yards with open sights. And they performed great on the elk as well.
Bullshop, no excuses, and maxiballs are good as well if your gun will shoot them. IMO the powerbelts would be my last choice. If you use them, be sure and don't use over 100 grains of black powder equivalent. Push them too hard and they come apart.
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Venor ergo sum (I hunt, therefore I am)
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.
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West by God Virginia.
We need to stop using these terms today, "Sniper Rifle", "Tactical", "Assault Weapon".
To be Colorado legal, the bullet can not be longer than twice the width. In other words, a bullet can't be over 1 inch in a 50 caliber or 1.08 inches in a 54 caliber.
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Venor ergo sum (I hunt, therefore I am)
Bullshop's 50s ( http://home.mchsi.com/~rltsr/bullshop.jpg) from the 400 grain to the N373 500 grainer are all Colorado legal and meet the 2X rule. That 460 grain MT NEx is a great choice. Dan is using a lube now, he calls it NASA lube and it is reported to be outstanding.