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Joined: Dec 2006
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Sidelock
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Sidelock
Joined: Dec 2006
Posts: 3,218 Likes: 121 |
Hi all, what is the standard bore diameter for a German 16ga circa late 1880's to around 1900?
Thanks so much!
Greg
Gregory J. Westberg
MSG, USA
Ret
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Joined: Apr 2002
Posts: 136
Sidelock
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Sidelock
Joined: Apr 2002
Posts: 136 |
Greg, I have 1907 JP Sauer hammer gun which measures .663 in one barrel and .667 in the other. Hope this helps.
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Joined: Dec 2006
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Sidelock
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Sidelock
Joined: Dec 2006
Posts: 3,218 Likes: 121 |
Thanks so much!! Sure does.
All the best!
Greg
Gregory J. Westberg
MSG, USA
Ret
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
There are two "Standards" for any gauge. First is the mathamatical equation for the given gauge which in the case of the 16ga is .662" or 16.8mm. The 2nd "Standard is whatever suited the maker at that particular point in time. Much variation will be found between makers or even the same makers over time.
L C Smith at one point in time specified .650" for their 16ga bores, but later went to the normal .662". Manufacturing tolerances will of course give slight variations to even the specified sizes.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,383 Likes: 106 |
You will certainly find significant variations when it comes to 16ga bore diameter. However, on most European guns--and it's certainly true of German guns, although I can't say positively when they started the practice--if the bore left the factory with a significant deviation from the 16ga standard, then the gun will carry a 2nd mark indicating the nonstandard bore size. Example: the barrel flats on my Sauer 20ga are marked 20 in a circle. However, right next to the 20 in a circle is a 19. That indicates that my gun is significantly overbored from the 20ga standard of .615, to the tune of about .010. And measuring the bores indicates that is indeed the case.
It's the same system the Brits used, Greg--with many 12ga guns carrying numbers like 13, 13/1, 12/1, to indicate that the bores are either underbored or overbored from the standard .729. And to keep you from thinking that the gun is out of proof when you measure the bores and come out significantly tighter or more open.
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Joined: Dec 2006
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Sidelock
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Sidelock
Joined: Dec 2006
Posts: 3,218 Likes: 121 |
Thanks all again!! Very helpful, nice to know that they followed the Brit system, makes things easier!
All the best!
Greg
Gregory J. Westberg
MSG, USA
Ret
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Joined: Dec 2001
Posts: 6,273 Likes: 205
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,273 Likes: 205 |
The chart on my wall shows German 16 bores [year 1939] at .6614 min and .6722 max. It shows British 16 bores [year 1954] at .6370 min and .6760 max.
Last edited by Daryl Hallquist; 06/09/11 04:43 PM.
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Joined: Jun 2002
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Sidelock
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Sidelock
Joined: Jun 2002
Posts: 9,350 |
No help. I was puzzled by the variances. Sent my 16 Sauer Model 8 off to a an outport Newfoundland smith and said open to IC both barrels. Came back with perfect POI and patterns. Duck soup over decoys!
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
.637" to .676" = 18ga to 15ga. This may be the accepted range of bore for the proof house to accept with a 16ga chamber, BUT, the bore would be marked as to its appropriate size.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
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Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,383 Likes: 106 |
.637" to .676" = 18ga to 15ga. This may be the accepted range of bore for the proof house to accept with a 16ga chamber, BUT, the bore would be marked as to its appropriate size. Bingo. Either with the separate gauge mark, or else with the bore diameter--depending on where and when it underwent proof.
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