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I start at the manual's OAL and go down from there depending on what my barrel likes.
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I load almost all my ammo LONGER than book length. Book numbers ensure that ammo fits in standard magazines but you can almost always go longer (at least a little) and still fit a magazine and many times there is no magazine to fit. In most cases, longer ammo (bullet closer to rifling) shoots more accurately than shorter ammo.
The only bullets that I load shorter than book are Barnes TTSX as their unique shape puts them closer to the rifling at a shorter OAL than most other bullets.