about measurements

[Al Capone]

Can anyone point me to a site of measurements of gauge and caliber equal to inch and CM ?

[Anthony]

I dunno about guage/bore as it probably isn't a linear scale.

But calibre is already in inches/cm.

E.g

For imperial:
.22 = 0.22 inches 50cal = 0.5" or 1/2"

For metric (even easier):
7.62 = 7.62mm 5.56 = 5.56mm

There are 10mm in 1cm
There are 25.4mm in one inch

[Jumala]

I´m not certain if it is what you mean but shotgun calibres like cal. 12 says that 12 lead bullets (ball form) with the same diameter like the barrel have together a weight of 1 english pound.
Cal. 10 is larger then 12. Only 10 balls are nessesary for one pound. (larger balls)

[Anthony]

Yeah, that's how they measure it, but I think that the scale is not linear. In that a 4bore is probably not twice the diameter of an 8bore.

BTW a 410 shotgun is not measured on the same scale, it's actually the calibre, being 0.410 inches.

[EventHorizon]

whats the specific gravity of lead, now figure, e.g, 10gauge, what size sphere would contain 1/10 of a pound of lead. Its late, I may be off on this. http://theforum.virtualave.net/ubb/smilies/frown.gif Will check it in the morning.

or you could find a chart...I may have one, I'll check.

IIRC, 12gauge is around .730" for a 'bore' or 'cylinder' choke, less for mod, full, etc.

[edit]
11.34g/cc

1/[guage #]*(453.6)=g lead each sphere

[g lead each sphere]/11.34g/cc=cc per sphere

cc each sphere=4/3pi(r)^3 = radius of sphere, x2, = dia of sphere, dia./2.54=decimal measurement of sphere

10g = .7754
12g = .7294
16g = .6631
20g = .6156
28g = .5521
32g = .5264

I was bored...



[This message has been edited by EventHorizon (edited September 10, 2001).]