There are some good ballistic programs out there to help you. Swarovski has an excellent one on their website for use with their scopes. Another option (which I am now using) is Strelok Pro which is an app you install on your phone. The trickiest part is calculating (guessing) the muzzle velocity for your load. Unless of course you have have access to a chronograph. but once you have the data inputted you can then verify the POI at longer ranges which will quickly tell you if your MV is correct. In Strelok Pro once you have done your estimates and checked the actual POI at a longer range. i.e. 500m, it will then calculate your actual MV based on the drop from your zero distance to your 500m impact point.
If your a leupold fan then the CDS system is great. Otherwise its hard to beat the Swarovski BT. Although the BT system may not be as robust if your doing some bush bashing.
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