I have only had a cheap Caldwell and a labradar.
The Caldwell worked surprisingly well once it was set up properly. Although I hit it with a sabot. Bullet went where i was expecting... forgot the sabot would be lower.
Labradar is a very cool unit. I cast my own for the 45/70 and from the different speeds at the different ranges that it records I can find out the true SD of the bullet and figure out holds at longer ranges.
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