For regular non-magnum cartridges I zero at 100m and drop test at 250m and somewhere between 300-400m. For the .308 it’s usually closer to 300m, for the 6.5mm it’s closer to 400m. I setup my .223 and .243 with drop tests at 250m and 325m.
It’s worth pointing out that if you are using an application like a Strelok, then it doesn’t matter if you don’t have a round number, as long as you have an accurate rangefinder, you can use whatever is easiest to shoot with a good backstop. It’s important to have the line of sight as flat as you can get it.
What I found is that if I want to extend my drop test range out to 500m then I need a really tall piece of plywood...
So far this method has worked well for me and I am shooting accurately past 700m with trajectory validated at half that range.
One thing that is really important to do is to test the tracking of your scope. You can have good drops data but a rubbish dial which screws everything.
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