I am not real experienced with metallic cartridge loading, but my one experience may pertain. it is possible that bullet shape difference affects this. ran into this my first attempt reloading on a . 300 wsm. chose to use barnes solids instead of duplicating factory winchester loads. loaded them to the same oal and was fortunate to find at the range that they would not chamber. from talking to a friend, depending on if they are secant or tangent ogive bullets they will contact at different points thus requiring different seatimg depths and cartridge lengths (in my case both factory and reloads were well shorter than max oal cartridge length, which is just the max length that the magazine and action can cycle and not really pertainant to what happens in the chamber)
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