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My turn to make a minor addition to the discussion. Gene hit the nail on the head with "pole vaulting mouse turds". Have realistic expectations and work towards achievable goals.
FWIW I train to two standards; hasty and deliberate. Hasty means hitting a rectangle 9" wide x 18" tall out to the weapon's max effective range as quickly as accuracy permits. At short ranges (< 250 M) that's a pretty generous standard and relatively easy with any of the listed zeros. PBR more than meets my requirements without meticulous measurements/calculations. Deliberate requires sub-MOA accuracy. Not as easy/fast but acheivable with practice. At longer ranges it's impossible without precision marksmanship skills.
An intimate knowledge of your weapons system and its ammo is critical. Especially since at longer ranges everything requires an adjustment for elevation. I'm amazed this thread hasn't mentioned range estimation yet. Personally I think it's more important than anything covered so far in the ballistics discussion (military quality ammo has relatively uniform, well known ballistics).
Most of my shooting now is KD for NRA Service Rifle. My match rifles are zeroed (iron sights) at 200 yds and I use "comeups" (more zeros) for 300, 500, and 600 yds. Gene's "thermometer" effect is readily visible when I forget to crank the sights down from one match to the next. Thankfully it only takes one round to realize the goof and sighters aren't part of the score. For convenience my carbines are zeroed at 100 yds which is fortuitous for the ACOG (TA31F) because it matches the BDC reticle.
This thread has reawakened my interest in optimizing trajectory/determining PBR. I will be chronying a new load shortly and will adjust the carbines to compensate. The wife's probably going to protest the range time (not really) but it'll be fun. My .02 - Peregrino
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