A French percussion gun with a 27 mm diameter heavy barrel.

[fernando]

Ferdinand Claudin
célèbre famille d’armuriers du 38 boulevard des italiens à Paris.
Made around 1850 ?
There will be further marks inside the lock.
With this calibre, a "4 GAUGE", this is a big game hunting gun.
Two things surprise me Jean-Luc; your taste for such 'vulgar' pieces and how you manage to measure the bore with the pied a coulisse in that position ... like reading 16,9 mm .

[Jon MB]

Très beau, bravo!

[Fernando K]

Kronckew

To the measure that marks the caliber should be added 1 cm, and the measurement is 26.9 mm

Fernando K

[Cerjak]

Originally Posted by fernando

Ferdinand Claudin
.
Two things surprise me Jean-Luc; your taste for such 'vulgar' pieces and how you manage to measure the bore with the pied a coulisse in that position ... like reading 16,9 mm .

Hi Fernando,
I bought it because with this very heavy barrel & big diameter this gun is out of the ordinary.
And so could stay in my heterogeneous weapon collection.
as explained by Fernando K you have to add 1cm to have the inside diameter.
Best

Jean-Luc

[fernando]

Wow; i have never heard of that; on the contrary, to my understanding, the actual muzzle aperture marks the calibre (bore/gauge) and the bullet to fit there has a narrower diameter... assuming we are talking smooth non rifled barrels, obviously. Why would you have to add one centimeter to quote the gun's calibre ? .

[Cerjak]

Originally Posted by fernando

Wow; i have never heard of that; on the contrary, to my understanding, the actual muzzle aperture marks the calibre (bore/gauge) and the bullet to fit there has a narrower diameter... assuming we are talking smooth non rifled barrels, obviously. Why would you have to add one centimeter to quote the gun's calibre ? .

Fernando,
When you using a" pied à coulisse" ,for internal diameter you have to add 1 cm to the mesure shown to have the internal diameter.

[fernando]

Guys, where do you buy your pieds a coulisse / paquímetros / calipers ?


.

[Fernando K]

Calibre de tornero

[fernando]

I must say that i never saw that type being used over here or out there; or that it even existed .