Re: Shooting on an angle
I am not sure exactly what math you are lookig for but to figure the angles based on a 100 yard zero is difficult. Your use was as follows:
"I elect to use the 100 yard 'zero' as the start point for the angle corrected elevation adjustment, I determine the amount of correction required to adjust for the LOS distance and then apply the angle cosine to this value. But, I have a glitch in that my 100 yard 'zero' value is NOT the correct 'zero' for the shot on the current angle problem, in other words, I have no 'zero' reference point for angular trajectories."
The only way I have been able to do it is using figures in drop inches from a zero yard zero. In other words, if the rifle was fired perfectly level you would need the inches droped at the range you desire to fire. For instance if you want to fire at a 45 degree angle at 500 yards you first find the level drop in inches and multply that number by the number below. Then deduct that number from your normal bullet drop at 500 yards and fire.
5 degrees: Normal bullet drop x .004
10 degrees: Normal bullet drop x .015
15 degrees: Normal bullet drop x .034
20 degrees: Normal bullet drop x .060
25 degrees: Normal bullet drop x .094
30 degrees: Normal bullet drop x .134
35 degrees: Normal bullet drop x .181
40 degrees: Normal bullet drop x .235
45 degrees: Normal bullet drop x .293
50 degrees: Normal bullet drop x .357
55 degrees: Normal bullet drop x .426
60 degrees: Normal bullet drop x .500
Example: 308 win using a 168 @ 2661 = -36" at 500 yards from a 300 yard zero. real drop= 81" at 500 yards. 81 multiplied by .293=24" Deduct 24 from 36 and you have 13" at 500 yards. Set the scope for 13" and fire.
I hope that helps. It maybe somthing you already know. I am not to good at the calculus needed for ballistics. Maybee you can help me??
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.