Woody_rod wrote:Ok, I'm bored, please explain how hunting ballistics are so different?
Woody,
The difference lies in the fact that fixed range target shooting is very two dimensional. As the range is a constant, the shooter only has to get his first shot near the centre with his first sighter, and make the required adjustment from that. The use of any B.C. is of limited use in this case. The BC can be off by a bit and it wont really matter. The thing that is of importance is wind drift.
If you have two bullets that you want to test and compare, you can come up with whatever BC numbers you like. The numbers may be accurate or they may not be. But the important thing is how much one bullet drifts compared to another. The B.C. numbers that you come up with may help or they may not, as the errors in calculating them may be too great.
So for F-Class, a definitive BC number is not that important. You just need to pick the one with the least wind drift. Alan has come up with a practical way to do this. I know of other ways but his is as good as any.
Field shooting is very three dimensional and so very different from F-Class shooting. The range is not pre set and you don't get sighter shots. If you need one you have failed. With regard to field shooting, I include tactical match and other forms of field target shooting where you only get one shot at a target, not just hunting.
The right BC "numbers" are important for this type of shooting. As is a heap of other information you will need. Not many, if any bullets can be used with a single G7 BC number right down to near transonic. Banded G7, BC numbers are what most serious field shooters are using now days. Even for shooting out to 1000 yards. Trajectory validation of your shooting system takes on more importance.
So for field shooting, both wind drift and elevation correction are both of great importance. While small errors in B.C. will only result in small differences in wind drift. The difference in elevation can be considerable. Thus the need to get it right at all distances.
If you want to get past the "old hat" BC way of thinking. You might want to consider custom drag profiles. These eliminate B.C. numbers all together. Some of these are now available to down load from Bryan for a $3 fee. These can be used in his AB program, but I am not sure if they would be available for Matrix bullets etc yet. Custom drag profiles have come about following the acceptance that single G7 B.C. numbers are not as reliable as first thought.
Having said that, I do think that single G7 numbers are all that you will ever need for basic F-class shooting out to 1000 yards.
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