Anomalous initial velocities
Today I was at the range testing a new load that yielded results which left me quite perplexed about the tendencies of certain loads despite current published data. Specifically, I've found a load using the Lapua 167-gr Scenar that, for whatever reason, wants to come out of the barrel at much faster than the mean initial velocity indicated in the reloading manual I'm using. Meanwhile, another projectile, the Lapau 185-grain Scenar, refuses to go any faster than the published data suggests. Mind you, this is happening despite strict adherence to the published data and withstanding control of all other variables. Have any of you ever seen such a phenomenon?
If you can see it, then you can hit it!