I have proof, Christensen, and hells canyon carbon barrels. The proof stays the coolest the the touch the longest, this makes me think its holding the most heat inside. I've also noticed they keep heat towards the chamber end whereas the others have appeared more evenly dispersed. I know I'm just some guy on the internet, however Proof is 10 mins down the street, I've toured their facility. I'm a proud Montanian, and if I thought they were superior, damn right I'd spend my money in the back yard. Paradigm barrels will perform, at least I hope! I have several coming. Their barrels are just getting to the point of shipment. Most of their barrels will be faster than normal twist to caliber for the FLM solid copper bullets their bringing out. Competition is a good thing for the industry. If they suck big weiner I'll own up to it, as I put my money where my mouth is. I think they're the leader in carbon tech right now. Call Matt at paradigm and talk to him, he's a pretty knowledgeable dude.