Back in BC days when Matt Grant and Tahr were young, it was standard to sight in at 25 paces. We did a lot more checking sights at the road end and campsite then.
Two things that make a lot of difference to your 25 yr impact are the distance you sight in for (100yd vs 200m) and the sight height above bore. Theres a lot more variation between shooters these days. In the 1970s and 80s everything used low mounted 32mm scopes and sighted for '200'. About 1/2 inch high at 25 was right. But not any more.
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