Identity and loads

[mausernut]

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

 

[PastorB]

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.

 

[64Springer]

Maybe 12mm is the groove diameter.

3.5mm deep grooves.

 

[mausernut]

Thanks for the loads. Looks like a smooth bore.

 

[user 48679]

There may be a maker's mark stamped into the barrel bottom, hidden by the stock.

 

[mausernut]

Already checked. Nothing

 

[TFoley]

Can you show us the rest of it? Or is that all there is?

 

[mausernut]

Here us the rest of it and underneath the barrel.

 

[mausernut]

I think it will be lots of fun

 

[TDM]

Could be a .40 or could be a .45 or something in between. If it is a smooth bore try a heavy patched .40 ball and work up as needed. 20gr 3F would be a good start.

 

[Trapper Scott]

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.

Notice the large gap between the ball and the caliper

A smaller gap between the bullet and the caliper

The 440 rb is smaller than the 12mm

Groove measurment taken at the muzzle with my 40 caliber Kibler

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

 

[TFoley]

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.

 

[denster]

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.