Originally Posted by Scot E
In what application do you use this math so often that it is so important?
I am reluctant to answer this as I feel you are just looking to argue one of your points again. But here are the facts that I will post in hopes the OP will get something from it for his benefit.
Lets start with set up. After load work up and chronograph testing I enter the average velocity into the ballistics program along with the advertised BC.
I then go to my private range where I have a flat section of ground and a mile long fence with a road along side it. On this fence are flags every hundred yards. I shoot groups from these locations and record the results to center group from several locations. Example, lets say the group at 600 yards is 6" low. I know that 6" low @ 600 yds, for all practical purposes within most all of our shooting cabilities is 1 moa low. So I need to add 1 moa to the dial up I used. I do this at many distances and will adjust BC or velocity until my rifle is as close as I can get it at all distances to the shooting solution my program provides.
Next I go to field practice. At this point I look through my Second Focal Plane scope and use my MOA reticle to measure the rock I am about to engage. I like rocks in the 1 to 1 1/2 moa size. So lets say at 1200 yards I know that 1 moa rock is 12" wide and 12" tall. I dial both windage and elevation in MOA for a dead center hit. If I hit right at the bottom of the rock I know at 1200 yards I need to come up 6" of the 12" rock to be dead center. At 1200 yards 1/2 or .5 moa is roughly 6". I then make the correction and fire again.
I like to practice a lot for a follow up shot. If I take the same shot at 1200 yards on a 1 moa rock and see the hit go left. I move my center reticle to the point of bullet impact and then look to see how many MOA to the center of target where my point of aim was. Lets say 2 moa on the reticle. I can then quickly hold over using the reticle and send a second shot. Or I can adjust the windage turret Left or Right 2 moa for a follow up.
I also use my SFP / MOA reticle to size up game. If I am sizing up a deer at 700 yards and with him looking my direction it is 3 moa across the spread of his antlers, I know he is 3 moa wide at 700 yards or 3 x 7" which equals 21" wide.
I did this on the Bull I took this year. I first seen him at 1200 yards and measured his spread at close to 4 MOA. Once I killed him I found I was off a little. 4 MOA at 1200 yards is 48". With the tape on him he was only 47 5/8" wide inside.
Also while spotting for someone while I am training or just out shooting I will use my reticle to give them a correction. Looking through my SFP NXS with a NP-R1 reticle in MOA I will place the center cross hairs on their point of impact. I will then call out what my reticle tells me they need to be center mass to the point of aim. Example: Come up 1 moa and left 1 1/2 moa. Also if I or someone shoots a group at , lets say 1200 yards on a rock. After their 3 shots using a very precise point of aim like a white calcium spot on a face of a rock. I will measure the group with my MOA reticle. If it measures .5 or 1/2 MOA I know that 1/2 MOA at 1200 is again 6" and a good group. I will also measure with my MOA reticle from center of group to point of aim. If the center of group was again 1/2 MOA or 6" from point of aim it will be inside the 12" kill zone of an elk I use.
I hope this method I use and teach is of help to some of the new shooters here. It works very well for us.