Forcing Cones Question

[OH Osthaus]

I agree, you don’t need to do it

But Just a small terminology point

You would need to lengthen the chambers to accept 2 3/4, it’s not just the forcing cone

[Drew Hause]

1. There is no justification for lengthening 2 5/8" chambers to 2 3/4"
2. There might be some advantage in lengthening vintage 1/2" - 5/8" forcing cones...BY AN EXPERT. Done wrong = ruined barrel



Scroll down about 1/3 here for a summary of Sherman Bell's study which suggested than pressure might be decreased somewhat with a longer cone.
https://docs.google.com/document/d/1...vwLYc-kGA/edit
Because the angle of the cone is greater than the external taper of the barrels, in thick walled U.S. maker's 12g (but possibly not light British 12g game guns or small bores) there is usually greater wall thickness in the cone than at the end of the chamber (breech to right)



I still wouldn't do it

[Live A Life Of Purpose]

Currently the barrels are at 2 9/16" when I measured them. Originally when the gun was purchased it was stated to be a 2 3/4" shotgun. Remington era after they took it over from Parker. However the barrels were not what was quoted. So I did get a very sizeable refund and the from the all the specs everything lined up in the books on the serial numbers across the board on the entire gun. I was looking for a newer Parker so I can reload 2 3/4" as I do a fair amount of waterfowl and pheasants that needs steel so obviously I buy RST shells in Bismuth. I have another DHE that is an older gun around the 1908 timeframe that is 2 9/16" that I love to shoot and the barrels all tested exact per purchasing. My question would be where do you send barrels to get looked at. I do have a barrel thickness gauge and I do measure the barrels, breach, etc. But where do you send barrels off to get inspected for cracks etc. I want to keep the integrity of the original state, but you have to go through a lot of guns to find guns that have not been tampered with. I appreciate all of your ideas and thoughts.

Originally Posted by Drew Hause

1. There is no justification for lengthening 2 5/8" chambers to 2 3/4"
2. There might be some advantage in lengthening vintage 1/2" - 5/8" forcing cones...BY AN EXPERT. Done wrong = ruined barrel



Scroll down about 1/3 here for a summary of Sherman Bell's study which suggested than pressure might be decreased somewhat with a longer cone.
https://docs.google.com/document/d/1...vwLYc-kGA/edit
Because the angle of the cone is greater than the external taper of the barrels, in thick walled U.S. maker's 12g (but possibly not light British 12g game guns or small bores) there is usually greater wall thickness in the cone than at the end of the chamber (breech to right)



I still wouldn't do it