I have read a lot of posts on the OAL 300 RUM. There seems to be big difference from about 3.600 to 3.700. Is this because the bullet ogive for a specific grain changes from lot to lot and manufacturer? I would think that factory rifles 300 RUm Sendero SF would all have about the same length to the lands. Give or take .005 one would think. I know that some want the rounds to fit into the magazine and others single feed, but I would think to a group of rifles made by the same manufacturer would be closer in OAL than that. I guess what I really would like to know is everyone here seems to measure OAL but shouldn't we be measuring from the ogive to the base of the shell.