Anyone know why, exactly, 150, 165 and 180 grain ammo in a .30-06 (for example -- pick any centerfire rifle round with decent velocity) have different points of impact?
What about different brands of seemingly similar ammo?
I understand slight differences in trajectory due to velocity, mass, etc. I'd expect some vertical change in POI, especially at a good distance.
I'm talking about 100 yards, no wind, bolt action. Group size near 1", so I'm also not talking about flyers.
Why does the POI change, say, 2" low and 3" left, or whatever, with slightly diffferent bullets or different manufacturers? What's the science here?
What about different brands of seemingly similar ammo?
I understand slight differences in trajectory due to velocity, mass, etc. I'd expect some vertical change in POI, especially at a good distance.
I'm talking about 100 yards, no wind, bolt action. Group size near 1", so I'm also not talking about flyers.
Why does the POI change, say, 2" low and 3" left, or whatever, with slightly diffferent bullets or different manufacturers? What's the science here?