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WINCHESTER Model 21
Bore and Choke Specifications

GAUGE

BORE DIAMETER

CHOKE

% in 30" Circle @ 40 yards*

CHOKE DIAMETER

CONSTRICTION

12

.730" .005"

Full

65% - 75%

.694" - .699"

.031" - .036"

Imp. Mod.

55% - 65%

.712" - .715"

.015" - .018"

Mod.

45% - 55%

.715" - .720"

.010" - .015"

Imp. Cyl.

35% - 45%

.724" - .726"

.004" - .006"

16

.670" .005"

Full

65% - 75%

.640" - .645"

.025" - .035"

Imp. Mod.

55% - 65%

.652" - .655"

.015" - .018"

Mod.

45% - 55%

.655" - .660"

.010" - .015"

Imp. Cyl.

35% - 45%

.664" - .666"

.004" - .006"

20

.615" .005"

Full

65% - 75%

.590" - .595"

.020" - .030"

Imp. Mod.

55% - 65%

.600" - .603"

.012" - .015"

Mod.

45% - 55%

.603" - .608"

.007" - .012"

Imp. Cyl.

35% - 45%

.609" - .611"

.004" - .006"

* Figures from "Winchester Gun Salesman's Hand Book" 1949

2010, M.C. Manges