doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Dove-tailed versis Chopper-lumps

This was predated by the French Ideal which had the chopper-lump with vertical dovetail soldered construction since I believe at least 1900. The construction is well detailed in the 1910 catalog.
There are two types of dovetails here. The traditional dovetailed lump (one lump dovetailed on 2 barrels, everything being brazed together), and chopper lumps barrels with integral lumps, dovetailed vertically together, so that the barrels cannot separate because of longitudinal forces.
BSA certainly did it, but I believe that the "Manufacture" did it first.
They did say in their ads that the soldering allowed for less tube distortion during the assembly, because of the lower temperature used.
Best regards,
WC-

One thing does seem "Absolutely Certain" here Winchester did not use it "FIRST" in spite of what Schwing said.

Here's a Schwing quote about "new" that Mike already provided above.

"Each Winchester barrel forging had a large long surfaced integral lug. While the idea for interlocking barrels was not new it was an idea that was not employed at that time among other American double gun makers."

Goodnes, NO, Chops, not a fight. I'm exchanging information and ideas.

M-21 ring bulges, hmmm, Mike, you are the second guy in a month who has a ring bulged M-21. Now, would the obstruction that caused these bulges have caused a "lesser" gun to burst? Also, the proof load test, as I recall the details, failed action working parts, not the barrels. BTW, the bulge area is work hardened and to sustain further damage would require a bigger obstruction than the first in exactly the same place.

For anyone wishing to perform a little work hardening experiment, get a common wire coat hanger and a couple of wire pliers. First, bend one place about 90 degrees by hand and count the number of times required to break the wire. Repeat with pliers forcing the wire to bend in the exact same location (it is difficult to keep the bend in the same place by hand).

On the other hand, I also love my M-21 skeet gun.

DDA

Just think of how heavy a 21 would be if they hadn't used 'special steel'.

Now Grasshopper, you can get the 12 gauge 28" double trigger splinter forend models in at 6-3/4 and 7 pounds all day.

The 12 gauge 3" models are much heavier, as are the "clays" models, as they should be I think. But out on the net there are hundreds of Perazzi and Krieghoff clays models that are as heavy or heavier.

I thought I had gone over this with you already. Please start paying attention.