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Actual Bore and Choke Measurements of Model 21's

Click on the A BLUE SERIAL NUMBER for details and photos of each gun.

Serial #

Gauge

Grade

Bore

Constriction

Marked

4,870

20

Field

Right

0.614

0.006

Mod

Left 0.615 0.022 Full

11,334

20

Skeet

Right 0.615 0.003 WS-1
Left 0.615 0.008 WS-2

15,617

20

Skeet

Right

0.615

0.002

WS-1

Left

0.614

0.011

WS-2

26,966

20 3-Inch

Field

Right

0.615

0.007

Mod

Left

0.615

0.024

Full

6,858

16

Skeet

Right

0.675

0.005

WS-1

Left

0.675

0.014

WS-2

6,515

16

Field

Right 0.612 0.008 IC
Left 0.612 0.021 IM

21,377

16

Field

Right 0.669 0.011 Mod
Left 0.669 0.029 Full

19,655

12

Skeet

Right

0.731

0.008

WS-1

Left

0.732

0.015

WS-2

23,359

12

Skeet

Right

0.730

0.004

WS-1

Left

0.730

0.016

WS-2

30,136

12 3-Inch

Duck

Right

0.7315*

0.004

IC

Left

0.734

0.016

Mod

12 3-Inch

Duck

Right

0.730

0.036

Full

Left

0.730

0.036

Full

* Note 28" Barrels for #30,136 were orginially choked Mod/Full.  The chokes were opened at Winchester's Custom Shop in 1966 to IC/Mod.

01/05/10 M.C.Manges