April, 1918 
F ORES T A N 1) S T R E A M 
235 
however, is not a new model, it having 
been on the market for at' least fifteen 
years. Advertising in the sportsman’s 
journals should be the best way to secure 
one of these revolvers. 
B. H. E., Miles City, Mont.: 
I noticed in a recent issue of your maga¬ 
zine that Dr. J. R. Bevis will answer ques¬ 
tions in ballistics in your columns, and I 
would like to have answer to the follow¬ 
ing: 
No. i. What would be the “zone of dan¬ 
ger’’ for mountain sheep, shooting the U. S. 
30-150-2700, the sheep being at a distance 
of 500 yards, shooting horizontally? 
No. 2. What would be the “zone of dan¬ 
ger’’ if the shot was uphill at the same dis¬ 
tance, the sheep being at an elevation of 
300 feet? 
No. 3. What would the “zone of danger” 
be if the shot was downhill at the same 
distance, the sheep being 300 feet lower 
than the shooter? 
Here are some, which he need not an¬ 
swer unless he chooses : 
1 killed a mountain sheep on the top of 
a 11,600 foot mountain in a snowstorm, 
the thermometer being 22 0 F. 
No. 4. Assuming that the shots in ques¬ 
tion 1—2—3 were at ir,6oo ft. altitude, 
what would be the difference in the “zone 
of danger” had the shot been at sea-level 
at 6o° F. on a clear day? The same dis¬ 
tance as question No. 1. 
Ans.—1. We shall assume the vital zone 
of the sheep to be 12 inches, and that the 
hunter holds on the middle horizontal line 
of this zone. Then six inches of the vital 
zone will be above and six inches will be 
below the line of sight. The bullet in its 
descending curve crosses the line of sight 
at 500 yards. ' At some point nearer than 
500 yards the bullet will be just six inches 
above and at some point beyond 500 yards 
the bullet will be six inches below the line 
of sight. The two points are the limits of 
the danger zone of that animal. In the first 
instance the point is found to be 26.8 yds. 
nearer and in the second case the point is 
23.8 beyond the 500 yards. The total width 
of the vital zone is, therefore, 50.6 yds. 
That is, if the sheep is over-estimated 26.8 
yds. the hunter shoots over; and if the 
sheep is under-estimated 23.8 yards, the 
hunter will shoot under it. 
2 and 3. The solution of these are the 
same and the results equal. The sight 
should be set for a distance found as fol¬ 
lows : subtract 300 squared from 500 
squared and take the squared root of the 
remainder which is found to be 400 yds. 
Now the sight set at 400 yds. will land the 
bullet 500 yds. at the angle made under 
these conditions, but the trajectory of the 
bullet with sights thus set will be higher 
than the 400 yd. horizontal trajectory and 
less than the 500 yd. horizontal trajectory, 
being 6.5 inches lower than the latter. 
Hence, the limits of the danger zone is 
found to be 63 and 56 yards respectively, 
or a total zone of 119 yards. 
4 - The influence of the high altitude upon 
the ballistic coefficient is practically coun¬ 
teracted by the influence of the temperature 
upon the muzzle velocity and also upon the 
ballistic coefficient. Hence, the danger zone 
at this altitude with temperature 20° F. is 
practically the same as that of 1. 2, and 3 
at sea level. J. R. Bevis. 
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