Chamber / Forcing cone

[Craig Budgeon]

For the forum members that are not aware there exist 2 types of reamers. There are chamber reamers that lengthen the chamber and reduce the taper of the forcing cone and forcing cone reamers which lengthen the forcing cone only. Your eyes, hands, and gun proceed with caution if at all.

[Joe Graziano]

Y’all are way to smart for me. I just run light 2 3/4 shells through my Parker or I stock up on RST shells at a shoot. If I’m shooting a non-Parker 16 ga with 2 1/2 chambers, I buy 2 1/2 shells. It’s pretty simple, but I’m a simple guy Lengthening the chambers costs money, decreases the value and don’t do a dern thing for the shootin. Ain’t gonna do that.

[Daniel G Rainey]

II kill just as many birds with 2 1/2 shells as I do with 2 3/4 shells and with less recoil.

[Drew Hause]

Parker Service and Proof Load table published in the 1930s and reproduced in the "The Parker Story" p. 515. 12g 2 3/4" shell Service Pressure is 10,500 psi. Definitive proof is 15,900 psi or 7.10 Long Tons. The pressure was measured using LUP and modern transducer values would be about 10% higher.

[Ron Scott]

We’re getting off topic from OP but while we’re at it here’s some interesting proofing info from TPS

[Drew Hause]

Thank you Ron. Those Lifter charges are of course for Black Powder and would have run about 1/2 of Bulk Smokeless introduced early 1890s.