Would you use them ?

[Bill Murphy]

Todd's comment about tapering the junction from the forcing cone to the bore got me thinking. Tapering the junction from the forcing cone to the bore is actually "lengthening the forcing cone". By the way, how much encroachment into the forcing cone is experienced in the first 1/4 inch of the forcing cone? I would rather have the extra metal than 150 psi less pressure.

[todd allen]

Originally Posted by Bill Murphy

Todd's comment about tapering the junction from the forcing cone to the bore got me thinking. Tapering the junction from the forcing cone to the bore is actually "lengthening the forcing cone". By the way, how much encroachment into the forcing cone is experienced in the first 1/4 inch of the forcing cone? I would rather have the extra metal than 150 psi less pressure.

Yes. "Lengthening the forcing cones" is what the procedure is called.
The gun is a 6 lb 5 oz 12 gauge, with 30" bbls, that came with 2 1/2" chambers.
Lengthening the forcing cones lowers the pressure, without weakening the chamber area.