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Unread 08-14-2016, 08:58 PM   #1
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There's a LOT more to this story that we will probably never know. I don't think we can learn anything from this exercise.





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Unread 08-14-2016, 09:39 PM   #2
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The current SAAMI maximum pressure for a 16ga 2 3/4" cartridge is 11,500psi regardless of shot and powder loading. At 80 percent of proof pressure, this requires minimum SAAMI compliant proof of 15,365 psi for a 16 ga gun, manufacturers may exceed the minimum standard .

Current production cartridges may be at or below the 11,500 pressure, particularly 1 1/8 loads.

At the time the Parker in question was made, the normal max pressure for 16 cartridge was 10,200 if I recall correctly, this gives a minimum proof load of 12,700 that the gun would have been tested with.

Tests have shown that chambers 1/4 " short increase pressure over nominal 2 3/4 by about 5 percent. Therefore assuming it was short by 1/4 " ( which may or may not be true) , a possible pressure could have been 11,500 plus 575, 12,075.

Therefore, the maximum pressure that factory shells loaded to maximum SAAMI specifications would have provided exceeds the load pressures the gun was intended for but remains less than what the gun was proofed with. The few tests done and reported in DGJ have demonstrated that the tested composite steel barreled guns withstood at least 4000 to 5000 psi above proof before they experienced non elastic deformation.

Neither the bore ID nor wall thickness has been disclosed for the gun in question. That information is critical to any informed analysis. O framed 16's , which this may or may not be , often do not have much wall thickness to spare.
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Unread 08-14-2016, 10:03 PM   #3
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We saw a fairly new Italian over under rupture forward of the chambers at the Southern about ten years ago. He was using Winchester trap handicap gold loads that would have been loaded to SAAMI max.

I have an acquaintance who had a Guerini rupture halfway down with factory handicap loads. He saw the shot cup fly out on the previous shot so it was not a squib and stuck wad issue. He later had the barrels measured, bore ID was standard but the wall thickness was less than .020, how far less I don't recall but they were made surprisingly thin.
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Unread 08-15-2016, 08:44 AM   #4
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It's possible that the offender didn't even know the barrels had swelled. I could easily see myself shooting a gun at an event where there were lots of people and commotion and never paying that much attention to the gun. Keep in mind the swells are just that - gentle swells - and not ruptures or jagged edged. The Damascus pattern helps hide them, too.


I'm not taking sides....but I gotta say whenever I let someone shoot one of my guns I am very specific about what shells they use. Very specific.

It appeals to the ego to be a laid-back gun dealer who jauntily hands someone a multi-thousand dollar, 100 year old gun while casually saying "Bring it back when you're done..." But I think the dealer in this case has learned a lesson the hard way and will be less magnanimous from here on out.

"Don't lend someone your car or your girl...someone might throw a rod in 'em."
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Unread 08-15-2016, 08:53 AM   #5
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Quote:
Originally Posted by greg conomos View Post
I'm not taking sides....but I gotta say whenever I let someone shoot one of my guns I am very specific about what shells they use. Very specific.

Whenever I let someone shoot one of mine, not only will I insist on what shells they will use - I will hand them a box or two of MY shells.





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Unread 08-15-2016, 09:39 AM   #6
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Quote:
Originally Posted by Dean Romig View Post
Whenever I let someone shoot one of mine, not only will I insist on what shells they will use - I will hand them a box or two of MY shells.
Very true. That way if something goes wrong, you have no one to blame but yourself. At least you know what shells are being used and if you reloaded them, then you know who may have made the mistake.
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Unread 08-15-2016, 07:31 PM   #7
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Quote:
Originally Posted by Dean Romig View Post
Whenever I let someone shoot one of mine, not only will I insist on what shells they will use - I will hand them a box or two of MY shells.





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Dean, how many of your guns can I borrow??
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Unread 08-15-2016, 07:56 PM   #8
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Honing or lengthened chambers would be the likely cause at that location. I once owned a GHE 12 which developed a bulge in the chamber when I was using a set of chambermates in 28ga. The "o" ring on the insert failed and the pressure was essentially trapped within the chamber. I found out later that the previous owner had lengthened the chambers to 2.75". That was a long time ago, way before I knew anything about barrel modifications.
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Unread 08-15-2016, 08:59 AM   #9
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Quote:
Originally Posted by greg conomos View Post


I'm not taking sides....but I gotta say whenever I let someone shoot one of my guns I am very specific about what shells they use. Very specific.

It appeals to the ego to be a laid-back gun dealer who jauntily hands someone a multi-thousand dollar, 100 year old gun while casually saying "Bring it back when you're done..." But I think the dealer in this case has learned a lesson the hard way and will be less magnanimous from here on out.
Couldn't agree more
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Unread 08-15-2016, 09:13 AM   #10
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All the commonly available factory loaded 1 oz 16ga cartridges I am aware of generate chamber pressures below 10,200, or the design max working load for the gun. 1 1/8 loads are over that to the full current limit of 11,500. It seems implausible that a person would come to shoot targets with 1 1/8 oz 16 ga loads.

We have yet to be told the bore or wall thickness of the bulged barrel gun.

At the time this G grade 16 Parker was made, the Parker recommended load was 7/8oz at 2 1/2 drams. How do you know the shooter did not go to the RST tent 75 yards away and get a box of shells with exactly that load? Why would that not be the most likely scenario?
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