Thread: Ballistic truing conundrum

Originally Posted by Skirch

Re zero at 200. The further out you zero the more error you can induce. Make sure it's exactly 200m. Or is it yards? That could cock it up.
Check atmospherics are correct, scope height etc. It all needs to be as close to perfect as you can get it if your going through a trying process.
625 is also on the close side for trying. 800m is usually the standard.
How good is your shooting? We're you shooting in a position or off something that the rifle could jump slightly higher? Carbon bipod on rocks or something? Or jambing the rifle down into the ground to get elevation?
It's not very hard to induce 1moa of shift, I've seen a lot more.

Zeroing done at 100 yards, see other post below. I never use metres, all measurements are inches, yards, moa, etc.
The 200 zero might be 205 or 195, but that makes naff all difference - maybe 0.1 or 0.2 moa at 625yrd. Not a cause for 1moa delta.

Atmospherics etc, covered by Kestrel. Again any small change or error is going to be sfa.

Yes ideally I’d do truing at longer range but 625yd is the max I have access to.

How good is the shooter? Good point. Good enough to consistently shoot 1/2 moa grps in light weight (6lb bare rifle) hunting rifles.

Shooting position- a bit average. After this shit wet winter the cattle have munted the paddocks good and proper. So finding a spot with out too many lumps and bumps not easy. Bipod (Spartan) had good lock up and stable forward load plus rear bag allowing a fairly solid platform.
Shots on gong poi was within 1in of POA so despite a less than ideal ground conditions I feel the results validate the accuracy.

My next step is to calibrate the scope dial up on paper at 100 yards.
As mentioned at start of thread have never seen a Leupy dial more than true moa. But maybe this is an exception?