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Forums10
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Jul 28th, 2025
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Joined: Feb 2002
Posts: 14,467 Likes: 278
Sidelock
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OP
Sidelock
Joined: Feb 2002
Posts: 14,467 Likes: 278 |
I own a full choke .410 Superposed that seems to have a muzzle diameter of .360 or slightly less, measured by more than one accurate means, small hole gauge, micrometer to measure the small hole gauge, and Vernier caliper. This seems to be impossible if the bore is .410. Schwing doesn't seem to mention .410 Superposed bore diameters. Does anyone on this forum have a mention of factory .410 bore diameters in the Superposed? I would appreciate a page reference in Schwing about .410 bore diameters. Thanks for any reply. Bill Murphy
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Joined: Dec 2001
Posts: 2,961 Likes: 9
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 2,961 Likes: 9 |
I would double check your readings. The diameter of the contact area of the gage becomes critical.
bill
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Joined: Jan 2002
Posts: 14,033 Likes: 1832
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 14,033 Likes: 1832 |
One of my .410s has a .034" full choke, which is the most constriction I have ever measured on one. Yours, as measured, would be .050", which is overly tight for an original 12, let alone a .410. The little suckers can be difficult to measure at times. I'd check the readings again, too. I'm not saying you're wrong, but it's far enough out of the norm for full that it warrants a re-measure, at the least.
SRH
May God bless America and those who defend her.
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Joined: Jan 2002
Posts: 14,033 Likes: 1832
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 14,033 Likes: 1832 |
Murphy, I looked through 9 pages of information on the Superposed .410, in Gabriel's book on .410s, and could find no mention of choke. There's piles of other info about .410 Supers, and if there are any other questions you have on your gun I'll be glad to see if he addressed them.
Best wishes my friend, SRH
May God bless America and those who defend her.
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Joined: Feb 2003
Posts: 4,110 Likes: 80
Sidelock
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Sidelock
Joined: Feb 2003
Posts: 4,110 Likes: 80 |
410 is not that difficult to measure with a telescoping gauge and a micrometer, and Bill claims to have done so.
With my El Cheapo Chinese $20 set I can get .0005 resolution.
The trick to measuring the bore behind the choke is to insert from the muzzle end, lock the gauge, and carefully slide it down the bore and out the breech end. A small rolled up paper tube will assist in keeping it straight. It's tedious, but can be done.
My K-20 measures .4015, which apparently is the norm for Germany. The chokes measure as expected relative to the bore.
Still.... 50 thou is a lotta choke but we don't know the actual constriction until we measure the bore.
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: Jan 2002
Posts: 5,950 Likes: 145
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,950 Likes: 145 |
My .410-bore Superposed is a New Model Skeet and the bores measure .408". The tightest .410-bore choke I own is the left barrel of my Winchester Model 23 Classic with a bore of .407" and .028" choke. The .410-bore spade on my bore gauge wouldn't go in that barrel, but someone at a long ago Vintage Cup had a gauge that would.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
I note that 8-bore said he measured the choke with a small hole gauge, he did not specify a telescoping gauge. Assuming that he is using the term correctly the two are not one & the same. He may or may not be able to slide the small hole gauge down the bore, haven't tried it. I have done so with a telescoping gauge. I was able to procure a Used, 12" handle for my Starrett telescoping gauge set so this is what I now use for all my bore & choke measurements. Another method of measuring the bore would be to oil it well, but lightly & then drop a round ball for a .45 caliber MLer into the chamber. using a short section of about a 3/8" dowel drive the ball into the bore beyond the choke & then with the largest dowel you can get through the choke drive it back out. Measure tha ball diameter & you will have your bore measurement.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Feb 2002
Posts: 14,467 Likes: 278
Sidelock
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OP
Sidelock
Joined: Feb 2002
Posts: 14,467 Likes: 278 |
Shotgunjones repeats the method I have used for years to measure a .410 bore. Tighten the small hole gauge behind the choke and then drive it out the breech, then measure with a micrometer. Bill Schodlatz mentions the contact area, which is a legitimate caution. However, my Starrett Vernier caliper has knife edge contacts. More investigation to follow. I did not measure the bore with the small hole gauge. However, I did notice that no poster has specified the bore diameter of a Superposed .410, which is what I would like to know, from Browning literature or Schwing.
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Joined: Jul 2012
Posts: 4,946 Likes: 345
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,946 Likes: 345 |
Eightbore,
I often use small bore gauges and have recently discovered the cause of some erroneous measurements. If it is used near the upper limit of that particular gauge, the moving wedge may be a good bit behind the contact points. If you then tighten it up too much, the contact points may deflect, resulting in a measurement larger than actual diameter of the bore. I did note you are concerned that your measurements are smaller not larger than expected, this time.
Mike
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