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Forums10
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Most Online1,344 Apr 29th, 2024
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Joined: Aug 2009
Posts: 56 Likes: 37
Sidelock
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Sidelock
Joined: Aug 2009
Posts: 56 Likes: 37 |
The .410 is a 67 gauge...it's a long, long way from 0.410 to 0.525...
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1 member likes this:
John Roberts |
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Joined: Feb 2002
Posts: 331 Likes: 6
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 331 Likes: 6 |
The bores on my 2003 Poli 32 measure 0.510". The chokes are supposed to be IC/Mod. The 32 bore chokes are too big for my .410 measures and too small for my 28 ga. I have patterned it. It is spot on.
Joe
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Joined: Mar 2002
Posts: 7,798 Likes: 566
Sidelock
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Sidelock
Joined: Mar 2002
Posts: 7,798 Likes: 566 |
We can do math. If it starts out at .410 bore and needs to end up with a new bore of .510 how much wall thickness needs to be removed? Audience say .050 from each wall for a total of .100. So does your .410 have walls .050 plus another .025? Call it .075 walls to keep the math simple. If they are .040, which would be heavy and thick as heck, you are still going to break through .010 too soon and have infinity walls.
Now for the real math question. If train A leaves the station heading due north at 80 miles per hour and train B leaves the station heading East at 60 miles an hour how long before they meet? I actually had this question on an exam decades ago. There is an answer that I got correct. No one else did and I always thought the question was a test of how dumb the prof was.
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Joined: May 2008
Posts: 76
Sidelock
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Sidelock
Joined: May 2008
Posts: 76 |
I've heard .410 is closer to a 36.5 gauge...
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Joined: Mar 2002
Posts: 7,798 Likes: 566
Sidelock
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Sidelock
Joined: Mar 2002
Posts: 7,798 Likes: 566 |
.410 is 67 to 67.5 gauge.
Last edited by KY Jon; 03/25/21 03:20 PM.
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Joined: Jan 2002
Posts: 5,906 Likes: 113
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,906 Likes: 113 |
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Joined: Jun 2002
Posts: 2,278 Likes: 94
Sidelock
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OP
Sidelock
Joined: Jun 2002
Posts: 2,278 Likes: 94 |
Yeah I’ve never heard it called 67 gauge.
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Joined: Jan 2002
Posts: 13,375 Likes: 1318
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 13,375 Likes: 1318 |
A .410 pure lead ball weighs 103.4 grains. There are 7000 grains in a pound.
7000 divided by 103.4 = 67.69825918
Thus, a .410 is a 67.7 ga. (rounded up)
May God bless America and those who defend her.
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Joined: Dec 2020
Posts: 971 Likes: 408
Sidelock
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Sidelock
Joined: Dec 2020
Posts: 971 Likes: 408 |
The term 36 bore or gauge is still sometimes used in Europe, particularly in Italy.
It seems to have sprung from a desire to have a “tidy” numerical progression , 20 to 24 to 28 to 32 to “36”, whilst ignoring the scientific basis of number of lead balls of that diameter to the pound represented by the other bore sizes.
Perhaps the gun and cartridge manufacturers felt that buyers would think a 36 bore would have more poke than a 67 bore, and would sell better?
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Joined: Dec 2020
Posts: 971 Likes: 408
Sidelock
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Sidelock
Joined: Dec 2020
Posts: 971 Likes: 408 |
A thought ( probably not worth the time typing it out?).
On the introduction of the Firearm Certificate in the UK for rifled cartridge arms many Rook and Rabbit rifles were bored out to .410 shotgun for which no Certificate was then needed.
Whilst that seems sad now it at least saved them from immediate destruction. Many were not, however saved from the combined effects of the late introduction by Eley in the late ‘50s or early 60’s of non-corrosive .410 cartridges and an apparent reluctance to clean .410 guns.
Many are now deeply pitted, both in chambers and bores. If they retain the original barrel profile they can be worthy candidates for re-lining to an original or modern small game round such as .32/20.
Others have had the forward portion of the barrel tapered or turned down. They may well retain enough metal to clean up to 32 bore if nor to ( more sensibly) 28 bore.
All of which is likely to cost far more that buying a brand new .410 Baikel. As I said at the start ....
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