Reply To: POI Shift, My Old Nemesis!!!

Forums PCP Airguns POI Shift, My Old Nemesis!!! Reply To: POI Shift, My Old Nemesis!!!



So I have two articles which  may help you. Both are from the firearms world, where there are a lot more people reading and writing on this subject, but stick with me I found them both very helpful.

This guy's name is Cal Zant, and he loves to rub science on a sport where there is a lot of myth and voodoo. I've always loved his mathematical breakdowns of different concepts and problems, because it allows him to effectively communicate the significance of something. In this case he is talking about wind calling ability, and while 1000 yards with a magnum rifle and 100 with a pellet are very different, there are some significant similarities as well. I've heard people in the PRS world say that 1000 yards with a centerfire rifle is like 200 with a .22 PB. I've got a lot more experience with the latter, and if that statement is accurate, I'd say then that 100 with a PCP is about equivalent to 200 with a rimfire. Food for thought. The point I rambled away from here is that all these things are the same, just on different scales, so it matters and this shows you why and gives you some tips on how.

There are a couple different articles out there like this one, but this one is one of my favorites. It gives you some good visual indicators which are not only practical, but allow you to start calibrating yourself and your other visual indicators. Wind speeds vary as you get closer to and further off the ground. Land can create updrafts and other features can cause wind to do all sorts of things. Where I live and shoot, I'm in an odd valley with trees and hills and obstacles, so I almost never see a single wind value from muzzle to target. So that is something to think about, how the wind is playing and where. 

Finally, I would strongly recommend picking up a weather station of some sort. Kestrel makes handheld anemometers for surprisingly high prices, however you can (relatively) cheaply pick up one of these:

My advice is to set it up somewhere that you sit frequently and can look out the window and see the actual station itself as well as the readout screen. Not only does it provide useful data like barometric pressure for shooting and wind speed, it allows you to watch the grass and the trees and mirage and such and get real time feedback about what that ACTUALLY means. It can significantly help your ability to generate good calls. 



I hope this was helpful. I realize I'm just some nut on the internet, but it has really improved my shooting so it may also improve yours. :)