Just read something in which Jack O'Connor recommended sighting in at 25 yards, suggesting that typically (eg, .30-06, 180 grain, let's say...) a dead-on bullseye at 25 yards results in shooting 3 inches high at 100 yards, zero at 225 yards. Unless I misunderstood, which is quite possible.
(He also said that if he could only have one all-around rifle it would be a .375 H&H, if he could have two it would be a .375 and a .270.)
I've always zeroed at roughly 2 inches high at 100 yards (depending on caliber/bullet weight/etc.), only using the 25 yard demarcation as a starting point to make sure I'm on paper in the vicinity of the target. But this is kind of an intriguing idea...
Wondering if anyone has ever done this (zeroed only dead on at 25)? Also, anyone with better background in ballistics than I have care to comment on the viability of this?