(Continued from Part 5. This concludes the article.)
In the ballistic charts that follow, the best zero for each type of ammunition is determined and we can see how much to our advantage it is to determine the actual trajectory of the ammunition and find the zero that makes the best use of it’s flat trajectory. I used the JBM ballistics calculator and the manufacturers data to find out what the true maximum point black range is when using a 24 inch barrel. The following data (and much more) can also be found at the highly-recommended JBM Ballistic Calculator website.
Category #2: Typical Factory Ammunition
Chart #1
.308 Winchester
This chart shows a 150-grain BTSP at 2,850 fps (commercial ammunition). Maximum PBR = 275 yards when zeroed at 235 yards. Highest point or midpoint and rise no higher than 3 inches above the aim point is at 125 yards. Wind deflection at MPBR = 7.7 inches. Ammoseek.com found this ammunition at .75 cents per round.
| Yards | Point of Impact in Inches | Drop in MOA | Wind Drift in inches |
| 25 | -0.0 | -0.0 | 0.1 |
| 125 | -0.0 | -0.0 | 5.5 |
| 235 | -0.0 | 0.0 | 9.4 |
| 275 | -3.1 | -1.1 | 7.7 |
| 300 | -5.6 | -1.8 | 9.3 |
Continue reading“Hunting in Desperate Times – Part 6, by Tunnel Rabbit”

