We are back to math again. I am today we are going to talk about percent difference. Percent difference is comparing two measurements and quantifying the difference as a percentage. I have the measurements of the velocity at the target.

Taking what we have learned so far, I am not going to go over the calculations again, but I will present the data.

  1. 849
  2. 853
  3. 866
  4. 859
  5. 855
  6. 870
  7. 852
  8. 853
  9. 868
  10. 858

That leaves me with an average velocity of 857.3 +/- 22.2 fps at 30′. You might ask yourself why you would want to know this information? Well, first of you rarely shoot something that is at muzzle length so you want to judge the amount of energy at some distance (effectiveness). I can also calculate the estimated amount of bullet drop over distance (performance). There is also some some consideration to gravity and the effect of friction. I would call that percent difference.

End Your Programming Routine: At some point in the future, I may decide to look out farther in distance for another data point. But I shot up all of those particular pellets which makes a true (scientific) comparison not possible. So, my next look is going to be the data that I have collected versus a new shaped pellet of the same weight. With that I am going to talk about statistical significance next week.