The only thing I use the base to tip measurement for is to see if the cartridge will fit in the magizine. Other then that it's always base to ogive. A much more consistant measurement.
I shoot Sierra 55gr Blitz Kings and my OAL to ogive is 2.095 which is .005 off the lands. My gun, a Savage Predator in 22-250 shoots best between .000 and .005 off the lands. SD and ES are also extremly low when I load this close.
I load 37.1 of RL15, CCI BR2's and am getting 3725fps w/ES at 12 and SD of 6.9 This from the 22" barrel on the Predator.
Good luck,
Cover Dog
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