The only time I've seen grams on ammunition cases was on some Greek-made 9 mm rounds. It was all in English, but all SI. And I doubt they had too many complaints about it.
For what it's worth, a guy whose wife fills her own shells told me that she weighs the loads in grams. Not grains--I specifically asked.
On 11/17/05, Jim Elwell <[EMAIL PROTECTED]> wrote:
At 17 11 05, 04:12 PM, Remek Kocz wrote:
>You're talking about airsoft BB's, right? I've seen them in the 6.0
>mm/0.12 g designations at Gander Mountain. Never saw any USC units,
>even in parentheses. However, once I walked over to the shotgun
>shells, the reality set in, as everything was in inches and (!!)
>grains. Some manufacturers did list the shell lengths in
>milimeters, but that was a rarity. There is an industry that we can
>pester about including metric information on their products.
The firearms & ammunition industry is like the printing industry:
slowly metricating, but so thoroughly steeped in a variety of oddball
units that it will take awhile.
For example, when you buy 9 mm rounds, the bullet weights are listed
in grains. Winchester lists their Russian 7.62 round as "7.62x39mm
Russian, 123 grain, USA Full Metal Jacket." (A grain, of course,
being 1/7000th of a pound, or 64.8 mg.)
In fact, I do not recall bullet or load (gunpowder) weights ever
using units other than grains.
Accuracy in firearms is often measured in minutes of arc, but I guess
that arguably qualifies as a "unit in use with SI"
http://www.answers.com/topic/minute-of-arc:
"This unit is commonly found in the firearms industry and literature,
particularly that concerning high-powered rifles. It is popular
because 1 MOA almost exactly subtends one inch at 100 yards, a
traditional distance on target ranges."
Jim Elwell
