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Wingman

Choke constriction on old Spanish gun

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Hi all

Can anyone confirm my thinking about the chokes on my old Spanish side by side?

Both barrels are marked at 18.5 which I assign is the bore diameter. The left barrel says CHOKE 18 and the right 18.1. I have always thought the gun has open chokes but I am guessing this equates to cylinder and improved cylinder or Skeet. 

Can anyone with better knowledge than me confirm my thinking?

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Not for one minute saying my knowledge is better, but simple arithmatic suggests 3/8 by 1/2 in theory.

The metric translated into Imperial gives .728 and then .713 and .709 so 15 and 19 points - ish. That assumes the barrels have not been re-worked.

Edited by wymberley

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41 minutes ago, wymberley said:

Not for one minute saying my knowledge is better, but simple arithmatic suggests 3/8 by 1/2 in theory.

The metric gives .728 and then .713 and .709 so 15 and 19 points - ish. That assumes the barrels have not been re-worked.

Surely you mean imperial?

Wingman, only way to be sure is proper measurement of bore and choke followed by a trip to the pattern plate.

Alternatively just get on and shoot it as it appears to work okay.

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Sounds about perfect to me for game. Every ,25mm tighter than the bore diameter is a 1/4 of choke. So you have one barrel .5mm half choke and the other .4mm just under half choke.

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15 minutes ago, TIGHTCHOKE said:

Surely you mean imperial?

Wingman, only way to be sure is proper measurement of bore and choke followed by a trip to the pattern plate.

Alternatively just get on and shoot it as it appears to work okay.

There we go, edited just for you.:good:

Edited by wymberley

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If it bothers you being roughly the same and you want more open in one shoot a lighter cart in that barrel and pattern test them.

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Spanish guns had the choke sizes originally stamped by the proof house . They did not use the same system as the UK but a between size system so they do nt exactly equate to what we are used to . I will try to find the chart and send it .

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1 hour ago, figgy said:

If it bothers you being roughly the same and you want more open in one shoot a lighter cart in that barrel and pattern test them.

You will never shoot 100 yard hand reared chickens with that attitude!

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Spanish choke sizes as compared with British .

Cyl   0.0/0,1 mm             Constriction    ,000 / ,004"

1/4   0.2/0.3 mm    ****          "               .008 / .012"

1/2   0.4/0.6 mm    ***            "              .016/ ,024"

3/4   0,7/0,8 mm    **              "               .028 / ,032"

Full   0 ,9/1/1 mm   *              *              .036 / 040 /045"

Not quite exact but within a coupe of Thou  allowing for conversion . Couple of Thou either way makes no difference .

Edited by Gunman

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2 hours ago, Gunman said:

Spanish choke sizes as compared with British .

Cyl   0.0/0,1 mm             Constriction    ,000 / ,004"

1/4   0.2/0.3 mm    ****          "               .008 / .012"

1/2   0.4/0.6 mm    ***            "              .016/ ,024"

3/4   0,7/0,8 mm    **              "               .028 / ,032"

Full   0 ,9/1/1 mm   *              *              .036 / 040 /045"

Not quite exact but within a coupe of Thou  allowing for conversion . Couple of Thou either way makes no difference .

hello, that is appreciated gunman, 

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