WT> In other words, multiply the velocity by itself (V ) in FPS (for
WT> example 750 times 750) and then divide by the constant 450,240 and
WT> then multiply by the projectile weight (PW) in grains (470 grains to
WT> the ounce). The result will give you the impact force (E) in
WT> foot-pounds.
Oooh, Wayne, can anyone play?
I prefer Edward Matunas' Optimum Game Weight calculation to the
old FPE calculation, which basically gives you a number without any
baseline for reference. In most laymen's terms, fpe has very little meaning.
Optimum Game Weight, OTOH, tells one *exactly* what one wants to know
about the end results of a projectile.
It is as follows:
 3     2              -12
V  x Bw  x 1.5012 x 10    
--------------------------  = OGW
           10
Where
V = Velocity
Bw = Projectile Weight
IOW, the Optimum Game Weight for a 7 MM Rem. Mag with a 160 grain bullet
moving at 2900 fps would be 937 lbs. Elk medicine. The .30-30 Winchester,
OTOH, with a 150 gr. bullet at 2300 fps, gives an OGW of 410 lbs. - good
deer rifle, but *not* elk medicine. This is the kind of info I can *use*.
So, if the velocity of the ball bearing was 400 fps (I think doable)
and it weighed one and one quarter ounces, we would get the following
Optimum Game Weight (IOW, the largest sized game we could expect to *cleanly*
kill) for the sling slung projectile.
                                    -11
(64,000,000) x (299,072) x  (1.5012   )
------------------------------------------  = 28.73 Lbs Optimum Game Weight
                10
'Course this one ain't perfect, either, because it assumes the projectile is
a non-frangible, expanding type. And it focuses on one shot quick stop
capabilities. For instance, a .22 with a forty grain bullet at 1250 fps 
yeilds an OGW of only 4.7 lbs., and we all know that the .22 will do better
than that in the real world. However, it *does* tell us that the .22 is 
*best* suited to very small game, much better so, in my way of thinking,
than does the figure "138 fpe". It does not work for bladed projectiles
such as arrows or crossbow bolts. Not to mention the fact that it discounts
the occaisonal "lucky" hit to the cranial region. As did Goliath...
    B U T......
         ...just for fun...
If we take what that dumb cracker Johnny already knows, and multiply that
OGW by the number two, we arrive at 57.46 lbs.
And 57.46 lbs multiplied by the number of letters in the Dead European White
Guys Language word for "unhhh huh" is 172.38 lbs.
And since 172.38 lbs plus the number of letters in the Dead European White 
Guys Language word for "unhhh huh" to the third power is 199.38 lbs., which
coincidently happens to be the weight of the average fully equipped U.N.
"peacekeeper", and the sling *might* become a viable weapon. [(2 x 3) + 3 =
9] and I am writing this at ten o'clock at night...viola! 19. See??????
Thanks to Edward A. Matunas for the first half of this post...
And to Calypso Louie for the second.
Direct to you from the keyboard of Larry Gault...
      
... Animals are much more than food...They're also leather and fur.
___ Blue Wave/QWK v2.20 [NR]
-*- SF-Quick/BW 1.00r [#48]
--- Alexi/Mail 2.02b (#10000)
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