Hmmmm...I'm going out on a limb here and venturing a few opinions that others may or may not agree with. It sounds to me like you are not measuring the specific bullet to your chamber--rather you are simply going by SAAMI spec for the over-all cartridge length (COL or COAL) as opposed to seating the bullet to the part of the bullet where the curve begins--otherwise known as measuring Cartridge Base To Ogive (CBTO or CBO).
You're starting off with a bullet design closer to a "flat-base" design (not as ballistically efficient as say the matchking or even gameking). I'm sure you'll get adequate results for taking deer--but don't be frustrated if you don't get spectacular one-hole groupings. On the other hand who knows--you may get lucky and prove me wrong . : )
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