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The COL can effect the way a bullet loads into the chamber, especially in an auto but also in a bolt action and a lever action. Yes, the distance from the lands effects pressure and accuracy. The volume of the case is effected. A heavier bullet is, as a broad rule, loaded longer than a lighter bullet. The length of a box magazine can set the maximum COL of a round. The shape of a bullet and if it has groves for lube can effect COL. A bullet with a crimping grove needs less neck held by the case neck.This is just the tip of the iceberg. Read, read, read. The slower the burn rate of the powder the more volume it generally has the more you might need to load longer. The faster the powder burns the less is normally used and the bullet can, if need be, loaded shorter.
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