I haven't used ballistic calculators much over the years. I zero my pistols for 50 yards and check POI shift in 5 yard increments inside 25 yards, then POI shift in 10 yard increments beyond 25 yards.
When zeroing a pistol caliber carbine I start with a 75 yard zero, shoot at 10 yard intervals and log the data. I usually only need to make minor adjustments from that point.
I will start with a 75 yard zero with the Roni/G22 to see if that would be a good all round zero. If POI is +/- 3.5" from the sight plane beyond 25 yards, I will be comfortable with a 75 yard zero.
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