Why not 11mm? or 12mm?

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Before folks get carried away, under U.S. law any cartridge firearm (except a shotgun) over .50 caliber (12.7mm) is a "destructive device" and subject to registration and tax. So you probably won't be seeing any 40mm derringers this week.

Not all. There are many guns over .50 caliber that have been designated as not being DD's based on the "sporting purposes" reasoning, they're mostly intended for big game like in Africa and such but available here...I don't see why a handgun (especially a revolver) over .50 caliber couldn't be similarly designated...
 
The .475 Linebaugh and .480 Ruger are 12mm cartridges...
 
I don't see why a handgun (especially a revolver) over .50 caliber couldn't be similarly designated

Because it is a handgun.
Hamilton Bowen has an article in the new American Handgunner about the .577 Ruger he built. Said the feds won't pass it as a sporting gun and it would take a manufacturer's license and $200 destructive device transfer tax for him to build them for sale. Don't know what that means for the status of the one he did build.
 
0.451" * 25.4mm/" = 11.4mm So why indeed an 11 or 12mm when we already have the proven .45ACP!

--wally.
 
Jim Keenan and Jim Watson posted very good replies as always - but - they forgot one.

Leastwise in my mind anyways...;)

Because some of us OLD folks were publik skooled in the South and never took a shine to Metric Measurements :)

Seriously- I was raised into a work, and Metric is what is used for quite a bit of it.

Imagine me, as a little Southern Brat and hearing: 9mm, 45ACP, 20 gauge, 2.8mm ball burr, #80 drill bit, B&S 24 ga wire gauge, .22 rim-fire, yardstick, fathoms...

"You get to start 1st grade in two more years" - grandma, mentors ...

Nuh-uh, :uhoh: the peanut butter and jelly sandwiches and recess sounded pretty good , but my gut said there was going to a lot more Skool and I wanted to hang with mentors and grandma, and shoot my wittle gun, go fishing, and mess with dawgies.

"This gun stuff will get more complicated as time goes on, folks just have to mess with a good thing" - Mentors.

Of Course they were correct...:p

4 years old -
I got a B&S wire gauge in one hand, a 20 gauge shotgun shell in the other, and nowhere did I see how this shell was a 20 gauge.

I just "knew" there was a "Browning gauge". Had to be.

25ACP "converted" to 6.35mm Browning. Okay, the neat Browning, Colt, and Beretta pistols that shot this cute ctg are sitting there on the table, Mentors cleaning, and talking and ..."how come a Beretta, used a Colt ctg,and was all this measured by a "Browning gauge"?

I did a lot of sitting on Mentors laps with a puzzled look and "I think Young'Un got another question, spit it out boy..."
:)

11mm, 12mm? Are you folks nuts? :D
 
We have 9mm and 10mm because they were both designed in Europe; the 9 way back when Germans and other nordic types were leaders of the firearms development pack and the 10mm because it was designed specifically for Dornaus and Dixon by Norma Projectilfabrik of Sweden for their Bren Ten and please don't utter 9mm and 10mm in the same breath as though they were somehow similar.:D Some folks drive Ford Pintos and claim they are entirely adequate transportation too.
 
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