Spanish .410

[Daveo26]

Can any one help figure out the proof marks on this folding .410 please?

They are really badly stamped and very difficult to make out but its is stamped

410 76.2 Im assuming thats chamber length? 3".

But is got either 650 kgs or 850 kgs stamped on the barrel

So its 3" chambers but not magnum proofed?

Its in good nick with no pitting at all. I have bought some 2" cartridges for it but would like to use 2 1/2" in it.

Does it sound safe?

[Andy H]

Rub some white chalk or anything that is similar into the marks to help you see the marks , I would find it unusual that a 3" is not proofed to magnum levels , you need to decode the proof marks have a look here and see if you can identify your proof markings.

 

http://www.shotguns.se/html/spain.htm

[Daveo26]

Thanks very much

Your link is not working http://www.shotguns.se/html/spain.html

I will study these. :o

[Andy H]

try this it is the main site and click on spain on the left hand side.

 

http://www.shotguns.se/html/caliber_marks.html

[Daveo26]

Its got numbers 33 and 37

so its proofed for 12.090 psi or 850 kg/sq cm which according to Eley is not enough to shoot there fourlong 2 1/2" cartridges

But its got a 3" chamber

[Daveo26]

Still got this problem!

Had it to a gun smith today, it's definitely got 3" chamber but seems to have a very low proof pressure of 850kg?

Not even enough for a 2 1/2" cartridge.

According to eley their 3" subs are 12,000 kg/sq cm same as their 3" magnums???

What a piece of ****!

[Gunman]

If it an older gun then it may have been proofed for cartridges that are no longer made . EG. The old English 3" standard was equivalent to 2&3/4" magnum but the proof houses no longer accept 3" standard and will only proof 3" guns at magnum proof .

[Rimfireboy]

850kg is low for a fourten. My little chimbo is marked 1100kg with a 3 inch chamber, and that's a bit on the low side for a magnum fourten.

[Andy H]

Here is a table of proof pressures by CIP.

http://www.cip-bobp.org/homologation/en/tdcc_public?page=3&cartridge_type_id=7

Pressure for the 2 1/2" cartridge is 830 bar maximum average pressure.

Rub some chalk minto the proof marks and post some pictures on here.

Edited August 15, 2014 by Andy H

[Daveo26]

That's as good as it gets!

[Andy H]

The lyalvale/express 2 1/2" 410 average pressure is 635 bar and the fiocchi 3" is 800 bar.

[Daveo26]

I tried 3" subs through it today, fired with some string from a distance, 5 shots no problems.

I shoulder fired one, **** that it kicks like a ten bore.

2 1/2s only !

[JohnfromUK]

My AyA 3" 0.410 is 1300 Kg. Made circa 1980.