
Up to now I've been using various balastic calculators that are on the web. JBM, Hornady's H.I.T, Nosler and several others. So far my experience has shown them to be close to real. However, I ran into the following problem with my 204 Ruger.
Let me first give you the load data and velocity:
Speer 39 grain TNT with a listed .202 BC
24.8 gr Rel 10X
3855 fps (several 5 shot strings from my 24" barrel)
Extreme spead 34 fps
Sight height is 2.2"
The speed is from my chronograph and from what I can gather fom my research is that this is within specs. The groups are respectable averaging 3/8" to 1/2" @ 100, 1" @ 200, 1 3/8 to 1 1/2 @ 300. The problem is that when I plug all this into a calcultor the bullet path should be close to the following: 100 yd zero, 200yd - 1", 300 yd -6". Point blank range is stated to be 356 yds with a 273 yd zero.
The reality is this, I'm getting with a 100 yd zero, - 3 1/2" @ 200, and -14 1/2" @ 300.



I know things are what they are, and I can live with what I'm getting from the 204, but to me it just seems to be a considerable difference between what should be and what is. Any thoughts on anything about what I've stated would be greatly appreciated.
Shoots For Fun