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-   -   Parker Chamber (https://parkerguns.org/forums/showthread.php?t=38665)

Mike Koneski 03-10-2023 04:45 PM
Quote:
Originally Posted by Parker Walz (Post 384259)
There is a high probability it is a 2.5 chamber. The thing is that a modern 2.75” shell fits in a chamber of that size because of the crimp (roll or pie). Shells are measured by the length before loading. That being said, if a 2.75 or 3” plastic shell fits in the 2.5” chamber and is shot the pressure will increase due to the end of the shell causing a constricted forcing cone. Not sure how dangerous that is but to be on the safe side there is nothing wrong with having it reamed to 2.75 for safety. Or if you reload, trim the hull to 2.5” then reload it.
Shell length is the measurement of the shell after firing. A 2 3/4" shell is the length after firing, not before.

John Taddeo 03-10-2023 06:37 PM
1 Attachment(s)
Variations of a 2 3/4 open hull?? Far right is a 2 1/2 RST..

Jim Thynne 03-10-2023 07:02 PM
Parker was known for short chambered guns, I never had a hammerless steel barreled gun that would not shoot 23/4 inch shells and pattern properly!

Richard Mason 03-11-2023 10:01 AM
Quote:
Originally Posted by Jim Thynne (Post 384419)
Parker was known for short chambered guns, I never had a hammerless steel barreled gun that would not shoot 23/4 inch shells and pattern properly!
That is interesting ,

Bruce Day 03-11-2023 04:18 PM
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 03-11-2023 06:14 PM
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 03-14-2023 12:11 AM
Parker Hang Tag
 
1 Attachment(s)
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

Dan Steingraber 03-14-2023 06:12 AM
Quote:
Originally Posted by Richard Mason (Post 384645)
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.

Dean Romig 03-14-2023 08:51 AM
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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Mike Koneski 03-14-2023 10:32 AM
Quote:
Originally Posted by Richard Mason (Post 384645)
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.


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