I intend to zero my rifle at 300 metres. Next I will set up very large cardboard targets at 100, 200, 300, 350, 400, 450, 500, 550, 600, 650, and so on out to 1000 metres.
These targets will be large enough to capture the bullet.
If I measure the drop and mark it so I can see it through my scope I should be able to create a reticle diagram with range holdover points without any calculation required. Just range refer to diagram and boom. Dinner is served.
Is anyone interested or kind enough to advise.
Last edited by Top End Hunter; 03-07-2013 at 11:17 AM.
Reason: Typo, clearer explanation.
Sure, .270 WSM, Thales ADI 2008, Magnum large rifle primer, 110 grain GS Custom mono-metallic HV hunting bullet. 62 grains delivers just under 3800 fps. I can go higher but this is pretty flat and it kills pigs, deer and goats like The Hammer of Thor.
If you hunt at the same altitude at which you do the testing it would work, otherwise not so much. I hunt between 3,000 and 8,500 feet so I have to read baro pressure with a Kestrel and dial up – but this is very accurate. Once you see how good this works, it is hard to do it any other way.
[QUOTE=Top End Hunter;774804]Sure, .270 WSM, Thales ADI 2008, Magnum large rifle primer, 110 grain GS Custom mono-metallic HV hunting bullet. 62 grains delivers just under 3800 fps. I can go higher but this is pretty flat and it kills pigs, deer and goats like The Hammer of Thor.[/Um? Is this where I put the quote?]
Barometric pressure varies with altitude not to mention weather conditions. Just looking at altitude, at sea level bp is 29.92“ Hg while at 5,000 feet it is 24.89“ Hg. Your bullet slows down much faster at sea level than it would at 5,000 feet. The bullet you are using has a BC of 0.375 and with a 200 yard zero, the drop at 1,000 yards assuming a 3,800 fps muzzle velocity while at sea level is 204 inches and it is 157 inches at 5,000 feet elevation. That is a difference of 1.2 meters just from changing the elevation.
If you have a Kestrel weather meter and a ballistic program running on your iPod or iPhone you read the barometric pressure, temperature, humidity and put that in your ballistics program along with bullet BC and muzzle velocity and it tells you how many MOA to dial up your scope. You make that adjustment, aim dead on, pull the trigger and dinner is served. This works at any altitude, in any weather.
The Kestel will also measure wind velocity and you can then similarly dial in corrections for windage. Furthermore, my iPod also has an accelerometer which allows my ballistics program to measure the angle of the shot, either up or down, if I just point my iPod at the target.
I used to think 600 yards was a long shot. Using these methods it is not even interesting anymore. You just don’t miss. Of course if you have wind, it is a whole different story but the wind meter helps figure that out also.