Fpchief,
Rereading your original post, I think we've taken you off on a tangent. It appears to me you were measuring Cartridge Overall Length (COL, see the right-most dimension on my drawing in my last post, above) and not distance off the lands. COL affects distance off the lands, but it's not the same thing. For COL, many bullets are too short to seat out to 2.800".
Often, lighter bullets have crimp cannelures (see the bullet in my drawing) that are meant to go most of the way into the case mouth for crimping and that will make the round shorter than 2.800" when they do. The Hornady 150 grain FMJ, for example, is supposed to seat in a .308 Winchester cartridge to just 2.780" COL. The Hornady 150 grain BTSP, SP, and SST bullets are supposed to seat to 2.735", about like you got, for the cannelure to line up correctly.
2.800" is just the maximum SAAMI dimension for commercial cartridges. There is no minimum. That maximum is used by manufacturers to ensure cartridges won't be too long to fit in a .308 Win. magazine. It's not required that you meet that number for the ammo to shoot. Shorter is fine.
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