I have been drilling the flash holes of .303 Privi Partisan brass with a 2.2mm drill, the results in shooting this brass do appear to give me more consistancy. Whilst drilling each flash hole out I am aware that sometimes the drill goes through the brass like a hot knife in butter and other times it is much harder to drill, my thoughts on this indicate that the holes must be of differing sizes. So the question is, do any of you reloaders do the same? And should I take this a step further and drill my Lapua .308 brass? Although at nearly forty quid a box I feel a bit shy of tampering with it!