I know a guy who's got a 12 ga SxS gun with Damascus barrels. He's concerned about barrel pressure, so he wants to get sub-gauge inserts & shoot 28 ga. in the gun.

The question is: If he used something like Briley Side Kicks, what would the barrel pressure be, compared to a standard 12 ga. shell? For this discussion, we'll use a 12 ga. 2 3/4" shell, 1 1/8 oz. of shot, velocity 1150-1200 fps, and for the 28 ga a 2 3/4", 3/4 oz. of shot at a similar velocity.

I believe the chamber & Side Kick would be strong enough to fire the rounds, but what happens with the rest of the barrel?

Full length tubes apear to solve all problems, but they also add close to a pound of weight, which is not beneficial.


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