- Dec 18, 2009
This got my wheels turning so I punched in a 300gr Berger otm at 2400fps for the 338wm which I believe HSM sells as a factory loaded offering and a 230 Berger otm for the 300wm at 2875fps also offered by hsm I believe, into jbm ballistics trajectory calculator. Which I feel is fairly accurate from past experience. At a 1000yds The 300wm was moving 1750 fps and carried 1500ish pounds of energy. Surprising to me was that the Vega was moving out at 1600Fps and carried 1600 pounds of energy. The nod went to the 338 for wind drift by .1 MOA and drop went to the 300 by 9 MOA. Lol I guess if you stick a 400 small block in the front end of a vega it might run just a hair different. Lol if a guy long throated a 30" barrel for the ol 338 vega I wonder if the 300wm could hang??? Looks like to me speeds aren't much different and a heavier bullet may penetrate better. Lol not that I believe a 300gr 338 cal bullet would have trouble penetrating anything with four legs but hey I was a little surprised at the potential of the 338wm. Just food for thought.
Using your numbers, at standard temp and pressure, with the Berger 300 EH and the Berger 230 Hybrid, JBM produced the following:
600 y 300 EH 1823.6 fps 2215.0 ft/lbs 16.7 MOA drop 3.1 MOA drift
230 HYB 2172.7 fps 2410.4 ft/lbs 11.3 MOA drop 2.6 MOA drift
1000y 300 EH 1482.1 fps 1463 ft/lbs 35.7 MOA drop 5.7 MOA drift
230 HYB 1764.6 fps 1590 ft/lbs 24.7 MOA drop 4.9 MOA drift
The .300 Win Mag beats the .338 Win Mag in every category. The gap doesn't narrow, at any point, all the way to 2000 yards.
An .8 MOA difference in wind drift is equivalent to more than 8 inches @ 1000 yards, enough to move a hit out of the vital zone with a small error in making the wind call. 11 MOA @ 1000 yards is more than 9 FEET of difference in drop. That may not matter as much if shooting steel or paper on a known distance range, but it dramatically increases the difficulty for shots in the field, while reducing the room for error in range or wind calls.