Who makes the best OAL guages? I have a weatherby .338/378. I went out to stoney point and they have a OAL guage but I am not sure. In the past with rifles like my Winchester70 / .308 I would bell the case a bit, put in a bullet, close the bolt, see how far it seated, repeated the process several times until I figured out the OAL for that specific bullet. That is the old way of doing things and I dont have a way to bell the case for my .338/.378. Also I am confused by the compairators I see out there. What IS the best way to firgure out the bullet length to seat it out .0015 from the grooves?