Choke sizes from Barrel markings.

525kev · Mar 21, 2017

Ok peeps i need some elp here please.

Have Fallen on an old Spanish sxs made in 1961 but i can't work back the choke sizes from the markings so need someone who is adept with an abacus

Left hand barrel
17.6
18.4

Right hand barrel
18
18.4

I know there's a formula but can't find it on tinterwebby

FreeShot · Mar 21, 2017

LH barrel is 0.8mm = 0.030" = 3/4 = Imp Mod

RH barrel is 0.4mm = 0.015" = 3/8 = Light Mod

Doctor Lecter · Mar 21, 2017

FreeShot said:
LH barrel is 0.8mm = 0.030" = 3/4 = Imp Mod

RH barrel is 0.4mm = 0.015" = 3/8 = Light Mod

I'm very impressed but what's the formula ?

schmokinn · Mar 21, 2017

https://shotgunsportsmagazine.com/archive/jan10/story0110.html

no formula just set restrictions

FreeShot · Mar 21, 2017

dr. lecter said:
I'm very impressed but what's the formula ?

On Spanish shotguns usually there are two markings on each barrel - the barrel diameter and choked diameter - difference between those is choke in mm.

Left hand barrel
17.6 - constricted (choked) diameter
18.4 - barrel diameter

Right hand barrel
18 - constricted (choked) diameter
18.4 - barrel diameter

chippy · Mar 21, 2017

dr. lecter said:
I'm very impressed but what's the formula ?

0.000 cylinder

0.005 skeet

0.010 1/4 or ic

0.015 3/8 or LM

0.020 1/2 or m

0.030 3/4 or I'm

0.040 full

525kev · Mar 21, 2017

Got it now .

Once choke mm is worked out you divide that figure by 25.4 to get the thousands of an inch (thou) measurement then match to table below and we have a winner.

Thanks FreeShot

balltrap · Mar 21, 2017

525kev said:
Got it now .

Once choke mm is worked out you divide that figure by 25.4 to get the thousands of an inch (thou) measurement then match to table below and we have a winner.

Thanks FreeShot

And when you know all that your scores will improve :lol:

jwpzx9r · Mar 22, 2017

And for anybody with a Perazzi who really wants to be confused by barrel marks :lol: The chart reads like some form of snooker ball arrangement for a new game :lol:

To be certain about your Perazzi it really needs the choke measured they are a law unto themselves those rebel Italian gunsmiths.

Wonko the Sane · Mar 22, 2017

jwpzx9r said:
To be certain about your Perazzi it really needs the choke measured they are a law unto themselves those rebel Italian gunsmiths.

I believe that the chart above merely indicates that Perazzi at any rate recognizes that there is a range within each designation that is acceptable. On my guns I just check to verify that the measurements are in the range and haven't been screwed with. Of course the Perazzi screw-in tubes are in the 1/10 at a time steps and are fine for the anal. I've managed so far with cyl/3/5/7/9

JMO of course - anyone can be as anal as they like

Choke sizes from Barrel markings.

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