A 308 zeroed for 200yd, with typical 150/165gr loads, will be two inches (aprox) high at 100yd and about 7-8in low at 300yd. Also, it'll be two feet low at 400yd. They made us memorize this in SOTIC ages ago and also the DOPE for a 500yd zero (that I've forgotten), which is how a lot of the US Army snipers rolled in Vietnam. Rick Boucher (NCOIC) was in a position to know, since he was one. The 500yd thing worked fairly well on a vertical human torso in the open, but it would never work for game.

Interestingly, the two inch underhold at 100yd is the reverse of the 2in holdover with an M4 at CQB distance. 100m zero on an M4? Not me, though I know a few steely-eyed killers who swear by it.

A long barrel and hot-loaded 155gr Scenars will flatten that 300/400yd DOPE out quite a bit.