doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Frame size SxS

Yep, they certainly were not ashamed to say so in advertising. They were including the 20 and the 16 when they came out with those ads, but I really think the 16 is better proportioned. But, each person sees beauty in a slightly different way.

SRH

Thanks Researcher, you made my point before I signed back on.

So, frame size is sort of governed by safe chamber wall thickness in the gauge ?

Also is true 12g, 16g or 20g frame size more of a matter of scale to the cartridge than it is to a measurement.

Does it then become more of a proportional balance thing based on weight, aesthetics & strength than to a particular mesurement ?

O.M

Well certainly the cartridges have a minimum distance between primer centers. Since the web between the chambers must survive a double discharge, whatever that thickness is determines how wide the barrel assembly can be.

The standing breech must be heavy enough to defend against the cartridges without tearing loose of the action flats. It needn't be wider than that minimum barrel set width. That's about as narrow as a barrel set can be.

You can make everything behind that as miniature as the operator can manage, provided you can set off the primers, and reach the trigger.

At a certain point it's kind of like a phone. It has to reach from the ear to the mouth.

Here's one you don't see every day: a 20 on a 16 frame. Nice combination.

AA Brown

I've been watching this one for a few weeks and it was just sold about 2 weeks ago.

Classic example of what I am questioning.
I would like to see a photo of the open breech, straight down the chambers.
To see the chamber wall thickness & distance between centres.
O.M

A couple or 3 examples of what you are asking to see would be:
A Crescent Quail Hammerless 410 would be 20ga wide, and 410 barrels. The breeches are extremely tapered down to the barrel diameter.
A Browning Citori 28ga, they are made on a 20ga fram, and weigh more than a 20. Externally they are identical to a 20. So, the chambers show extremely thick walls, same primer centers as 20ga. And, just about every multi-barrel set, they will have the firing pin centers (the common dimension) for the widest bores, and the other gauge sets have to match them.

Which brings me to Don Amos' brilliance.

The handling dynamics of shotguns with much of their mass concentrated around their balance point is now measurable.

Thank Don for that.

With whatever frame size, trigger spacing, etc, that you desire, you can measure the handling dynamics your shooting style requires for your success.

My 28-inch barrel Superposed New Model Skeet Guns in 20- & 28-gauge and .410-bore all weigh within a fraction of an ounce of seven pounds.

If you want to see thin chamber walls, the Parker Bros., 1-frame, DH-Grade 10-gauge is the champ!!

I haven't seen that one Dave but I'll challenge it with Parker No. 10165, a twenty-gauge lifter built on a frame size about equal to the 00 frame, with exceptionally thin chamber walls. Jim Parker wrote about it in the Mar/Apr 2003 issue of Parker Pages and I'll be re-publishing it in the Fall 2017 Issue but with a bunch of new pictures, including a shot of the breech with my thumb in the picture to give some perspective to it.