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I am also unsure of hash marks on the reptile, but I agree with your methods. With my .22 I have simply checked drop in 10yd increments after 50yds. No calculator or MV needed, just real world data...

You can also just figure out what the subtensions are between dots when the scope is set to 12x, if you’re using a chart, adjust the chart values to suit.
Finding full magnification is usually...