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About 1/2" per yard is about right with Vang.
I think the best way to buy a Vang Comp shotgun is to watch his web site and buy a shotgun or barrel that has been already done. Usually, its seems that he has some surplus that he puts on sale. Perhaps extras from a big job.
Cheaper than buying the gun separtely and sending it to him.
Its suppose to reduce recoil somewhat as the shot and charge don't get bunched up. They move through the barrel easier. Its hard to tell though.
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