I have some experience with the Proof Research barrels in both gas guns and bolts. They are definitely lighter. They have very similar thermal properties to a bull barrel, but maybe very slightly better. They are accurate on par with anything else out there. Rigidity and sensitivity to charge weight is good. Barrel life is unchanged.
I would not hesitate to get one on a rig you intended to carry a lot - whether for hunting or precision rifle competition or whatever. I wouldn't bother for a gun that's going to live on the bench.
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