Here is what I can tell you
Sunday morning at Tomball, it was pretty cool, around 50 degrees. I had worked up a real good load the week end before when the temperature was about 80 degrees. Using the same load, I had at least a bullet hole of verticle Sunday Morning.
Since I was weighing each charge to the tenth of a grn. (Denver Instruments scale), I can tell you exactly how much it took to get the Rail shooting in a mid one or better group capability. Just .2 grn. I went from a flat 30.0 to 30.2, and it made all the difference.
If it only takes that much to cancel out a bullet holes worth of verticle, then it probably doesn't take much more to get it back, one way or the other.
That's another good thing about weighing every charge. You are just not shooting for an "average in the load window", you know exactly where you are.
The temperature never got over 70 all day, and the tune stayed there in both my Rail Gun and my Sporter. I wish it would have got upto 80, soI could see if I would have had to lower the charge back to 30.0.
The humidity was in the mid 50 range both week ends........jackie
