What is nominal bore diameter of 20 gauge?

[Glamdring]

I know 12 gauge is .729"

And 16 gauge is .66" (more or less)

Can't remember 20 gauge.

 

[PJR]

Shotgun Bore Diameter
10-Gauge = Bore Diameter of .775 inches
12-Gauge = Bore Diameter of .729 inches
16-Gauge = Bore Diameter of .662 inches
20-Gauge = Bore Diameter of .615 inches
28-Gauge = Bore Diameter of .550 inches
67-Gauge = Bore Diameter of .410 inches

 

[Glamdring]

Thanks.

Been nagging me for several days. Read something recently that mentioned that 577 NE was basically a 3" 20 gauge brass shell.

 

[Highland Ranger]

Remington has a great soup to nuts shotgun course at: http://www.remington.com/safety/sbc_begin.html

This gauge chart is from there:

FYI - Gauge = number of lead balls of the diameter of the guns bore it takes to make a pound. So for 12 gauge, 12 .727" diameter lead balls make 1 pound.

 

[Highland Ranger]

Shot size chart

also from the Remington course:

 

[Dave McCracken]

That's what I LOVE about this forum. Someone asks a question and get answers with charts and diagrams within 1.5 hours.

Well done, folks!!....

 

[sm]

Tidbit:
You will note from chart:
For shot sizes #9 to #1, the number 17 minus the shot size equals the diameter in inches.
[17-9=.08]
Just in case you don't have a chart, or you need to bet a buddy as to whom is going to buy coffee.
-Don't have a similar memory tool for other shot sizes and the like.