There are a lot of theories about how a choke works and most of them are probably wrong. The Vang Comp System uses techniques that are well known and have been used by trap shooters for a long time. You should understand that the main purpose of the Vang mods is to produce smaller patterns with buck shot. It does that very well. It also allows the use of any other ammo that can be fired in a 12 ga. shotgun, something that you probably shouldn't do with certain screw-in chokes.
It should also be understood that the Vang Comp System was designed with law enforcement in mind. The idea is to increase the effective range of buck shot and reduce the chances of collateral damage. In other words, put all the pellets in the target. A pellet that misses the target is not a good thing.
Regarding the finish of the bore. I saw some of the original Vang Comp barrels when they were bored by hand. Let me tell you, they looked like an old stove pipe, but they sure shot good. For a while, they put a 120 grit finish on the bore, but it was found that a rougher finish worked better. It has also been found that a fouled bore tends to shoot tighter patterns with buck shot then a clean bore.
I have talked to Hans about his barrels and there is one thing that I find interesting. Of the hundreds of barrels and shotguns he has sold, not one has been returned for a refund. A few barrels have been returned because the owner didn't feel that the patterns were tight enough, but no one has ever asked for his money back. How many businesses can say that?
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