Back in the day when I was meat hunting and then farming I would often check my rifle at 25 yards. If it was dead on at 25 I knew it was close to 3" high at 100, dead on at about 250, and that I didn't need to hold over until around 350 yards. It worked fine in-spite of not knowing the exact trajectory. If I got a couple of shots nearly touching at 25 yards I thought I was a bloody marvellous shotI used to shoot deer between 25 and 300 yards no trouble (no range finder though).
We sure do worry about a lot of unnecessary shit nowadays.
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