Just getting into reloading and have been reading on here for a while. My question is how short is to short for brass. I am reloading 300 win mag I have once fired brass from ABM ammo not sure the brand but was told its really good brass. Book says 2.620 but my brass is shorter than that is that ok? And should they all be the same length to the T? I am not looking to shoot 1000yds but would like to make some good hunting ammo. I am loading 185 classic hunters. Thanks.