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roost shooting choke for hatsan


Archie-fox
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Not my work but you may find this useful.

 

If all your shots are less than 30 metres, you don’t need a full choke. If you are shooting at aerial targets no closer than 45 metres, only a full choke will do the job. Larger shot sizes are best used with tighter chokes because of the lesser number of pellets in the pattern, just as small shot is best used in more open chokes as the pellets are so light that they will be ineffective at longer ranges anyway.

 

With six common shot sizes and five standard choke sizes in a double-barrelled shotgun, there are more than enough permutations and combinations to experiment with, until you can find the ones that work best.

 

 

Table 1: Choke constrictions and designations

Constriction (mm) Constriction (inches) British Designation European Designation US Designation Pattern at 36 metres

0.00 0.00 Cylinder CL Cyl 40

0.25 0.01 ¼ ++++ Improved Cyl 50

0.50 0.02 ½ +++ Modified 60

0.75 0.03 ¾ ++ Improved Mod 65

1.00 0.04 Full + Full 70

 

Table 2: Bore diameters - British proof law

Gauge Number Bore Diameter (inches)

4 1.052

8 0.835

10 0.775

12 0.729

16 0.662

20 0.615

28 0.550

 

Table 3: Pellet count for various shot sizes

Shot Size 9 8 ½ 8 7 ½ 6 5 4 2

Pellet count - 28gm load 585 485 410 350 225 170 135 90

Pellet weight grains 0.75 1.07 1.10 1.25 1.94 2.57 3.24 4.87

Pellet diameter (mm) 2.30 2.16 2.29 2.41 2.79 3.08 3.30 3.81

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Dont bother getting worked up about chokes and which one to use. Just put any choke in and get on with shooting the gun. Most misses are caused by the person behind the trigger or the gun not fitting you properly not what choke you've got in the barrel.

 

Cheers

Ben

Your correct mate but also you do not want to blow the pigeon to bits if your eating them :good: you do not want them full of lead :lol:

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