wch
I have experimented with several 870 barrels and jug choking. Both met with fair results.
For those not aware of this choking system. The principle of jug choking is that a section near the muzzle is reamed larger than bore size with angles on the front and rear areas to increase the performance of shot loads. . It is not a constriction type of choke, so there is no danger of excessive pressures being developed.
Presently I have seen adds for jug choking blackpowder scatterguns, and at one time the gunsmithing service at GUNSITE did this choking on fighting scatterguns. I am also aware of some adds for DYO plans for this type of choke. Sorry I could not be of more help.
Good Luck & Be Safe
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First, with the most, WINS!
Regards, Scattergun Bob
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