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Forums10
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Mar 28th, 2026
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Joined: Feb 2003
Posts: 4,120 Likes: 86
Sidelock
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OP
Sidelock
Joined: Feb 2003
Posts: 4,120 Likes: 86 |
What do we know about 410 bore sizes?
I just acquired a K-20 barrel set in 410.
Barrels marked 10.2 mm which converts to .40157.
They do indeed measure .401 and .400.
The choke constrictions (Krieghoff screw-in) based on .400 bore seem reasonable, so this boring is intentional.
Is this common or is it just a Krieghoff thing?
Any clue why they underbore a 410 target gun?
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: Feb 2004
Posts: 13,883 Likes: 21
Sidelock
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Sidelock
Joined: Feb 2004
Posts: 13,883 Likes: 21 |
Jonesy,
I measured some of mine and they run from around .410 to .417
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Joined: Jan 2002
Posts: 5,964 Likes: 166
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,964 Likes: 166 |
Crescent Fire Arms Co., New Empire, bores .415"
Ithaca NID Field Grade, 10/31/34. bores .415"
Skeetmaster Tubes for Remington 3200, bores .409"
Winchester Model 42, pre-War Skeet barrel bore .407", post-War Modified barrel .410"
Winchester Model 23 Classic, left .407" right .408"
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Joined: Dec 2001
Posts: 6,552 Likes: 395
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,552 Likes: 395 |
Minimum and Maximum Bore Diameters [from a chart I copied years ago]
U.S. -- .410"--.430" [ANS Z299.2]
England--.4050"--.416" [1954]
Germany--.4016"--.4173" [1939]
Japan--.4094"--.4252" [JIS B 9804]
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Joined: Feb 2003
Posts: 4,120 Likes: 86
Sidelock
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OP
Sidelock
Joined: Feb 2003
Posts: 4,120 Likes: 86 |
Interesting.
Thanks for taking the time to measure and post.
From Daryl's chart, it appears 10.2mm is right at the minimum for the country of manufacture.
My only guess is that they are going for maximum barrel wall thickness and weight attempting to match the dynamics of the 20ga barrels.
I have yet to weigh the barrel sets.
It shoots great and is loads of fun... no 25's yet, but close a couple times. Very much a work in progress and something of a challenge...
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: Jun 2011
Posts: 35
Sidelock
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Sidelock
Joined: Jun 2011
Posts: 35 |
I too am getting into more subgauge shooting and had purchased a K20 28 gauge. Is there a reason why Krieghoff underbores their 28 and .410 gauges? What kind of patterns did you get from your K20 .410?
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Joined: Feb 2003
Posts: 4,120 Likes: 86
Sidelock
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OP
Sidelock
Joined: Feb 2003
Posts: 4,120 Likes: 86 |
I've not patterned it, due simply to inertia and perhaps fear of what I find out ruining my confidence in it.
Since I started this thread, I've shot 3 25's with it using the factory '0' chokes.
The pattern must be adequate.
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: Jun 2011
Posts: 35
Sidelock
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Sidelock
Joined: Jun 2011
Posts: 35 |
I've not patterned it, due simply to inertia and perhaps fear of what I find out ruining my confidence in it.
Since I started this thread, I've shot 3 25's with it using the factory '0' chokes.
The pattern must be adequate. Thanks for the reply. I'm debating whether to get the .410 barrel (32") or add the .410 to my Perazzi MX20. Perazzi overbores the .410 to .413. Krieghoff underbores the .410 at .402. I would not think .008 would be of a detriment to the pattern.
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Joined: Feb 2003
Posts: 4,120 Likes: 86
Sidelock
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OP
Sidelock
Joined: Feb 2003
Posts: 4,120 Likes: 86 |
Dunno.
I can tell you the 410/K20 is a delight to shoot. Mine is 30" mostly because the 20ga barrels are 30" and it came with a 30" two barrel case. I've shot the 32" and it's a tossup. Either is fine.
Sources indicate the 410 responds well to forcing cone polishing to bring in flyers, or at least 410 tubes do. I've not tried it myself.
I have noticed that jazzing up the muzzle velocity a bit makes for deader clays. I use #9 at about 1330 fps.
Addicting gauge.
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: Mar 2011
Posts: 3,044 Likes: 137
Sidelock
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Sidelock
Joined: Mar 2011
Posts: 3,044 Likes: 137 |
I just measured the .410 barrels in my K32 4-barrel set: Bottom barrel .407 bore and top .409. Back in the 80's I shot several 100x100 with this gun, so I think barrels are pretty good. I measured a Browning super I own....both barrels .407 bore. Take care, Buzz
Socialism is almost the worst.
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