Parker Chamber

[Bruce Day]

A DGJ article of some years back demonstrated that the pressure rise was in the order of several hundred PSI out of a normal load of 8,000 .

[Dean Romig]

Right Bruce but something less than 500 as I recall, and to the best of my memory, it was around 300 psi.





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[Richard Mason]

I was researching some more on useing a light 12 load in 2 3/4 in a 2 1/2 chamber tonight and found a great chat on double guns

When i think light load , I’m talking more so about the pressure and the velocity
Say anything under 1150 PSI

I thought this very interesting


E6A7DD18-76A2-49F0-9800-A475D4B1A293.jpg

[Steiner]

Originally Posted by Richard Mason

I was researching some more on useing a light 12 load in 2 3/4 in a 2 1/2 chamber tonight and found a great chat on double guns

When i think light load , I’m talking more so about the pressure and the velocity
Say anything under 1150 PSI

I thought this very interesting


Attachment 115007

Great hang tag. I think you’ll find most of the folks here prefer significantly less pressure for a variety of reasons. I obviously misread the 1150 as 11,500. My apologies.

[Mike of the Mountain]

Originally Posted by Richard Mason

I was researching some more on useing a light 12 load in 2 3/4 in a 2 1/2 chamber tonight and found a great chat on double guns

When i think light load , I’m talking more so about the pressure and the velocity
Say anything under 1150 PSI

I thought this very interesting


Attachment 115007

Richard, I think the 1150 PSI is a typo? I don't know anything with only 1150 PSI.

[Dean Romig]

Does 107705 have composite barrels or fluid steel?
I know Parker Bros. never differentiated between the two in their load recommendations…





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[Researcher]

Me thinks Richard meant 1150 fps!!

I have collected pictures of fifteen 12-gauge Parker hang tags and I can make no sense out of why some are targeted with 1 1/8-ounce loads and others with 1 1/4-ounce loads. Some state "Use Shells 2 5/8 Long" and others state "Use Shells 2 3/4 Long".

The earlier tags, below about 150000, have a line above that states "Length of Shell X x/x Inch", always filled in 2 5/8?!?

Just to be a little more irritating a couple of tags show the gun being targeted with bulk smokeless powder and the load is given in grains.

[Dean Weber]

Richard,

Even though these discussions are a repeat of others over the years, I find them fascinating. To Researcher's point, even documentation/advice on hang tags is very confusing. In my estimation, chamber length, as a safety concern, is overstated.

For example, I just measured a John Dickson 12 ga. with documented/proofed 2.5" chambers. However, my chamber gauge tool measures them a little more than 2 9/16. I also measured a James Woodward 12 ga. which is documented/proofed at 2.5" but I measure them at 2 5/8. These are documented guns from notable gunmakers where both went through proofing houses. Yet, the chambers are definitely not exactly 2.5". Obviously, these were not lengthened to 2 3/4.

Then if you add in the differences in shell length after the shot, we get many different lengths of spent shells, even though they may be marketed as a 2 3/4 length. My point is an AA shell is 2 11/16 long after firing. Should I be concerned about 1 or 2/16's overlap in my expensive Dickson/Woodward guns which were only proofed at 2.5"? The answer is no for me, as I know my barrel condition is good.

My recommendation is to concern yourself with condition of your barrels first and go have fun 2nd. The chamber length in most cases is a distant concern. That does not mean to disregard pressure or velocity in your determination.

[Pa SxS]

I agree Dean.

[Dean Romig]

A few of Morris’s loads are 1150 psi.






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