doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Chamber Porting!!

Not saying this one was engineered, but I think some newer autoloaders use chamber ports to regulate the cycling of different shells. This set up might not work too well for a chamber insert if it has to work with the extractor?

Can't tap off gas in the chamber... there's a shell in there and you would be blowing a hole in it.

Autos tap gas a good bit further down the barrel.

They vary in design, some use a higher pressure point than others.

Regulation for different loads is accomplished by what amounts to a 'waste gate' of some sort. Above a certain pressure, the gas is vented.

My first thought was the barrels might have been considered scrap and someone wanted to pressure test loads, accessing the chamber pressure through that hole. Dunno.

Take a peek at the new Remington. It looks like longer shells block gas from being tapped off, and it doesn't seem like it damages any of the fired hulls. I not planning on getting one of these guns, but it just looked like an example of where chamber porting might not be so dangerous.

I shall, thanks for the tip.

So, what is the surface area of the soldered up hole in percent of a square inch...times psi should give the pressure on the solder during firing?

Yes, but it's the area not the percent, because both units are in square inches. So the force is going to be pretty small. The force on a 1/16" hole would be about 32 pounds at 10,500 psi chamber pressure. The new Remington VersaMax uses a series of gas ports in the chamber area such that different length shells close off different numbers of the ports to regulate the gas being bled off to run the action. Works quite well and the plastic hulls are strong enough they do not get damaged.

Just what I was getting at Virginian, I just didn't write it as plain as you. I also didn't run the numbers but thought it would be somewhat small. Thanks.