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Old March 4, 2013, 06:06 AM   #26
Pond, James Pond
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OK, thanks for the input on the Franchi.

As for the Beretta, bruises heal, chambers do not, so as long as the gun is OK, then I'll grit my teeth and try it...
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Old March 4, 2013, 06:59 AM   #27
drcook
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Folks,

Here is a link to another forum where they discussed chamber size etc. One (some) of the posters showed how to make gages for and how to reliably check shotgun chamber lengths.

http://www.nevadashooters.com/showthread.php?t=18270

It has some very useful information

dc
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Old March 8, 2013, 10:25 PM   #28
Two Old Dogs
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The numbers you found under the forearm indicate various barrel measurements .

18.6/70---This is the chamber diameter, 18.6mm which equals .0632", the diameter of a 16 guage chamber. 70 is 70mm chamber length.

16.5/17.1---16.5 is the diameter of the choked portion of the barrel-16.5mm which equals 0.649". 17.1 is the diameter of the 16 gauge bore-17.1mm which equals 0.673". The degree of choke is 0.6mm or 0.024". This equates to an improved modified choke.

The 3 stars is the European marking for improved modified choke.

I do not know what K and 0.775 mean

34 Grams is the weight of the shot charge which is 1.2 ounces in US terminology, a moderately heavy shot charge.

Your shotguns should present no problem when used with standard 2 3/4" or 70mm ammunition.
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Old March 9, 2013, 02:32 AM   #29
Pond, James Pond
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Thanks for the further input, Two Old Dogs!

Just to point out the 34gr load is for the 12g. The 16g has a 28gr load cartridge!
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Old March 22, 2013, 02:13 PM   #30
Pond, James Pond
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Well, that was interesting!

Having lubed them as best I could, I tried them both out and all I can say is "limbsaver please, Santa".

The VC Franchi 12G was set to "heavy loads" as per PetahW's guidelines. I reasoned that if the cartridges I had were light loads, the worst that would happen is the gun would not cycle, with no damage to components.

Clearly the Nobel cartridges were heavy loads because it cycled perfectly and left a gun-but shaped hole in my shoulder! That thing kicks!! Good thing I didn't decide to test it with slugs!

Then the little 16G. I was expecting more pain as it is insanely light (and the VC is pretty light too), but luckily the 16G cartrigdes were milder, albeit not mild!

So both work and both were fired today for the first time in about 40-45 years!!

Brilliant!
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Old March 22, 2013, 06:46 PM   #31
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Quote:
18.6/70---This is the chamber diameter, 18.6mm which equals .0632", the diameter of a 16 guage chamber. 70 is 70mm chamber length.

16.5/17.1---16.5 is the diameter of the choked portion of the barrel-16.5mm which equals 0.649". 17.1 is the diameter of the 16 gauge bore-17.1mm which equals 0.673". The degree of choke is 0.6mm or 0.024". This equates to an improved modified choke.
um......how does 16.5 mm equal 0.649 inches while 18.6 mm equals .0632??

18.6 = .732 which is a 12 gauge nominal bore size, 70 is the chamber length (2-3/4")
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Old March 22, 2013, 07:21 PM   #32
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Quote:
shot weight is 34grams of 0/0 by Nobel Sport
If that is Italian Nobel Sport that would translate to UK BB / US #1.
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