Thread: trajectory validation distance

Often your long range is up in the hills somewhere. Remember the altitude affects air pressure a lot. At 1000m above sealevel Its about 80% which is equivalent to increasing your ballistic coefficient by 25%. So use a barometer eg in your phone or if youve got one on a kestrel. And check on the day at metservice and the adjustment for the ICAO standard atmosphere (wiki or gooogle). Work out how to allow for thT onyour ballistic app.

Start with the bc from brian litz Bullet database.

Dont adjust your mv too much to match your obsserved trajectory. Use an actual tall target and measure drop with a tape measuree because clicks can be out. Myguess is clicks are no more accurate than a chrony. ?

I did 100m 300m and 500m when I started with my 7mm08. But had a lot of trouble hitting a target at 600m until i had a shot on an 800 yd range and got the final tweakings right.

It wont hurt to use 800m if you can get it because you may want to shoot at targets further than you shoot at deer.

Around 900 m my 7mm08 goes subsonic and the bullets go into a parallel universe.

Ask on here and people will point you to litz, ICAO and so on if you need.