Thanks Joe Nobody, you really went straight at the issue I was searching for regarding the ojive,,

Thanks Joe. Useful information that can be done cheaply. Say hello to Jake. Blessings.

Thank you for the vid, Mr. Nobody. However, with boat tail bullets, wouldn't it be better to measure the bearing surface from ogive to ogive, rather than from ogive to base? I'm wondering if controlling the bearing surface can have an appreciable effect on controlling velocity, and thus eliminate some of the vertical flyers I get. I use Sierra 175 grain Match Kings at 500 yards, also out of a .308.

You’re right but you shouldn’t ignore the length from the olive to tip because overall length of the bullet variance results in bullet’s ballistic co-efficient varying. That does have an impact on bullet velocity and flight characteristics.