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Anyone have an idea of who built this. Also wondering what should be used for loads.
Says 12 mm but the barrel only measures about .40 not .47 C992B6B3-A9F3-4DA7-83A8-C5EC0AA39E2F.jpeg A572303F-681F-4EEA-A9D5-48622C80FC66.jpeg
 

PastorB

40 Cal
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No idea who built it, but if it is indeed a .40 caliber, I would use 20 to 30 grains (volume) of 3f or equivalent sub, and a .390 round ball with a patch of .010 to .018 thick. That will get you shooting safely, and then you can experiment and tweak your load to perform to your satisfaction.
 
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Not sure if I'm of any assistance, but this is what I found when measuring a few round balls and a bullet. All measurements were taken in millimeters to give you an idea of how the 12 mm size comes into play. It seems to me it is much closer to a 45 than a 40 but I would measure the grooves and lands and see what your measurements divulge.
1670049404650.png

Notice the large gap between the ball and the caliper
1670049442514.png

A smaller gap between the bullet and the caliper
1670049554814.png

The 440 rb is smaller than the 12mm
1670049651376.png

Groove measurment taken at the muzzle with my 40 caliber Kibler
1670049762376.png

Lands measurment taken from the same 40 cal Kibler at the muzzle.
 

TFoley

62 Cal.
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Drilled touch-hole kit gun? Hence the serial number, but supplied with the breech plug to home installation, hence lack of proof marks. The 77 is an assembly number, and the 12mm is simply a 'near-enough' calibre to distinguish it from any other calibre that the original manufacturer may have produced. I bet it's Spanish, and from the 60's.
 
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Drilled touch-hole kit gun? Hence the serial number, but supplied with the breech plug to home installation, hence lack of proof marks. The 77 is an assembly number, and the 12mm is simply a 'near-enough' calibre to distinguish it from any other calibre that the original manufacturer may have produced. I bet it's Spanish, and from the 60's.
It is Spanish from the 60's and 70's I believe eig as the importer as I recall they went for 29.99 at the time.
 

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