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Joined: Jan 2002
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Sidelock
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2 1/2" shells are not necessary if you will load low pressure 2 3/4" shells. Do not imply low pressure from light shot load; they do not necessarily go together. I've nothing against 2 1/2" shells; they are period correct. They are also more complicated and add complexity to your shooting.

DDA

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If you reload "low pressure" 2 3/4", remember to build in an extra safety cushion. Per Bell's tests with long shells in short chambers, reported in Double Gun Journal, the extra length of a 2 3/4" hull in a 2 1/2" chamber can result in a pressure increase of 1,000 psi. It's a bit harder to get really low pressures with a 20ga than with a 12ga, but there are recipes out there. And given the weight of that gun, if you're shooting targets, you'll probably really like 3/4 oz reloads. Easy to do with Claybuster's 3/4 oz wads.

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Pretty sure Mark Larson can make the extension disappear. Looks to need a new pad anyway.
Nice gun. Fair warning, you will spend a lot of time looking for number one!
I would wager that you will find the barrel walls to have substantial thickness, it was typical on French guns. Low pressure is a good thing, but, takes on less urgency with a French double gun that has .050-.080 barrel walls, 9 inches from the breech.

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Ted

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Sidelock

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Do you have Mark's information?

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As long as the gun has adequate barrel thickness, which with the proofs it has it probably does, extend the forcing cones and then go ahead and shoot 2-3/4" shells through it. That solution has always worked great for me. With modern thin walled plastic cases, extending the forcing cones is a good idea for better patterns even if you stick with 2-1/2" shells.

Steve

Last edited by Rockdoc; 02/16/16 11:10 AM.

Approach life like you do a yellow light - RUN IT! (Gail T.)
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It has been my casual observation that as we doublegun guys age (and, drop off) that most prefer to spend their money on unmodified guns.
We have a nice selection of Uggies, and Muslim (Turkish) guns that can be modified to our hearts content. But, an original French gun with a pedigree like this one has is a bit harder to find.
Not saying that the owner shouldn't modify it to suit his needs, but, do that with clear thoughts of just what he has.
Just sayin'...

Best,
Ted

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