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Joined: Feb 2008
Posts: 49
Sidelock
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OP
Sidelock
Joined: Feb 2008
Posts: 49 |
From what i have been able to determine fromLee Kennett's article in the '75 Gun Digest my new to me boxlock was given a definative proof 11.6 grams of powder and47.3 grams of shot to get a proof load of 12,800 PSI . the service load is 5.8 Grams of powder and35.5 grams of shot. It is a 65mm chamber. If I converted the grams to ounces correctly it is a 1 1/4 oz load of shot. does anyone have an educated guess about what pressure the service load would be?
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Joined: Aug 2007
Posts: 12,107 Likes: 381
Sidelock
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Sidelock
Joined: Aug 2007
Posts: 12,107 Likes: 381 |
I'd have to re-read Kennett's article, but first considering gauge, I wouldn't venture over 9k psi and the service load stamped on the tubes I've seen on pre-1912 16 bore doubles was 2.2 grams. I'd say the German's "square" load is just under or right at 1 ounce. 1 1/4 oz is going to rattle your teeth in most pre-WWII German sporting arms.
Kind Regards,
Raimey
rse
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
About 2/3 of the proof pressure. This would give 8533 lbs, but this would have likely been crusher pressures. Should be good with anything not excedeing 9K actual PSI by the PE method, assuming the gun is still in proof.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Feb 2008
Posts: 49
Sidelock
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OP
Sidelock
Joined: Feb 2008
Posts: 49 |
Thank you for your input. the gun is still in proof and @ 6# 14 oz. 1 1/4 oz loads are out of my pain threshhold, I was just going by the tables in the article. I also didn't think about it until this morning but therew was no differance shown for 65 or 70mm chambers. I welcome any opinions based on real world expeiriance. Hot roddind agood old gun is NOT my intention. Thanks again.
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Joined: Aug 2007
Posts: 12,107 Likes: 381
Sidelock
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Sidelock
Joined: Aug 2007
Posts: 12,107 Likes: 381 |
Post 1939, I think that per 5mm additional chamber length an increase of 1400 psi was expected. Post WWI, I would expect that international proof rules to apply. Upon patterning, you may find that 7/8ths or 1 ounce loads perform the best.
Kind Regards,
Raimey
rse
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