Editor, The Armory Life
Depends on if it’s a FFP or SFP reticle.BDC scopes are supposed to be used at maximum power.
However if bullets are striking lower than subtended,
at 400 yards for example,
couldn't the power be gradually decreased
until the 400 yard hash mark subtends the point of impact?
In essence, "indexing" the reticle by adjusting the power
instead of mapping the reticle and committing it to memory.