Post by awesome on Jan 11, 2021 1:44:20 GMT -5
I'm trying to figure out what went wrong the other night when I went out pig hunting. I lined up a perfect headshot from 20 yards and missed, then missed two more follow-up shots. I had verified my sights were still on target, but I hadn't had time to put the rounds on paper before I left for the hunt. So, I don't know how far off my sights would have been. I had planned on putting some subsonic rounds on paper today to see what was going on, but we got a bunch of snow here in Texas today.
So I ran the numbers through Federal's ballistics calculator.
I'm trying to take the scope and the zero range out of the equation to make things equal. According to this calculator, at 100 yards there's a 9" difference in point of impact between the supersonic and the subsonic load. That makes sense, and that is fine. At 20 yards, there is a .3" difference, which doesn't explain why I missed.
Now, I may be missing something. I'm new to this whole ballistics thing. I don't have a chronograph yet so I miss a lot of data there. But, if I'm sighted in with the supersonic rounds at 100yards, (pretty much dead on), I should be dead on from 20-140 yards or so, which is about all I'd want to use the .300BLK for anyway. I understand that the subsonics will drop off more as distance increases, but... at 20 yards I should still be pretty much dead on, right?
As soon as the fields dry out a bit I'm going to put some subsonic rounds on paper at different ranges. I'm just trying to figure out if I'm missing some factor that I haven't considered yet.
So I ran the numbers through Federal's ballistics calculator.
I'm trying to take the scope and the zero range out of the equation to make things equal. According to this calculator, at 100 yards there's a 9" difference in point of impact between the supersonic and the subsonic load. That makes sense, and that is fine. At 20 yards, there is a .3" difference, which doesn't explain why I missed.
Now, I may be missing something. I'm new to this whole ballistics thing. I don't have a chronograph yet so I miss a lot of data there. But, if I'm sighted in with the supersonic rounds at 100yards, (pretty much dead on), I should be dead on from 20-140 yards or so, which is about all I'd want to use the .300BLK for anyway. I understand that the subsonics will drop off more as distance increases, but... at 20 yards I should still be pretty much dead on, right?
As soon as the fields dry out a bit I'm going to put some subsonic rounds on paper at different ranges. I'm just trying to figure out if I'm missing some factor that I haven't considered yet.