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Discussion Starter · #1 ·
Is it in fact 410? I know that a number of guns are chambered for 45 Colt/410 Shotshell. I was thinking a neat option would be to make a round based on a 30-06 or 8mm Mauser shell that had rifling for whatever caliber bullets would match the 410, or a column of shot like a usual 410. Could be used in rifle actions for standard 0.473" bases and loaded to rifle pressures for an extra potent loading for s shotshell that caliber, or a decent rifle round the same diameter.
If indeed 410 shotguns have a bore of 0.410", then wouldn't a barrel of a 41 magnum correspond to it the same way 12ga shotguns have rifled bores? Or would 0.416", 0.429", or 0.454/0.458" be more appropriate?
 

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Are you in the nookie sabatical mode?

You have far too much time on your hands to think...dang! LOL
 

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Battle see here....
Gauge Bore Diameter
1 1.669"
2 1.325"
3 1.157"
4 1.052"
5 .976"
6 .919"
7 .873"
8 .835"
9 .802"
10 .775"
11 .751"
12 .729"
13 .700"
14 .693"
15 .677"
16 .662"
17 .650"
18 .637"
19 .626"
20 .615"
21 .605"
22 .596"
23 .587"
24 .579"
25 .571"
26 .563"
27 .556"
28 .550"
29 .543"
30 .537"
31 .531"
32 .526"
.410 .410"

Gauge - System of measurement for the internal bore diameter of a smooth-bore firearm based on the diameter of each of that number of spherical lead balls whose total weight is one pound. The internal diameter of a 12 gauge shotgun barrel is therefore equal to the diameter of a lead ball weighing 1/12 pound, which happens to be .729" (Or in British: Bore.)

.410 is not really a gauge, except by convention. It is the actual diameter of the bore in decimal inches.

The Gauge/Bore system is also used to describe the internal barrel diameter of large-bore, 19th century, English, single-shot and double-barrel black powder rifles.


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Discussion Starter · #5 ·
I am well familiar with the shotgun gauge conventions. I was just making sure 410 is actually 0.410". When 38 Special is 0.357" and 38-55 is 0.375ish, when 32 ACP is 0.311", when 7.92x57 and 8x57 are the same thing with different pressures, when 0.308" loadings are called 7.5mm, 7.62mm, and 7.82mm, and when 410 and 45 Colt are interchangeable, and when the 12ga Moss 835 is "overbored" to 10ga, I feel I actually have to ask whether 410 is actually 0.410".
 

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Well, I don't know if it's helpful or not, but at the gunshows I see these little derringers for sale that will take either a 410 shell or a 44 magnum. I almost bought one once, but they look like they would hurt to shoot.
 

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As an Engineering student, the solution is obvious. Cut open a .410 shell, use your calipers to measure the shotwad. That'll give you the basic shell size in actuality.
Of course, that doesn't take into account the gun's choke. You'll need to slug the bore of the gun to see what the actual minimum bore size is.

Just needs a little elbow grease. :cool:

Measure it, and you'll know it for sure!
 
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