get off it zrex ... flat means nothing to a deer hunter if your talking 40gr or 50gr bullets. simply put.....the 25-06 is a slightly better deer round than the 6mm. it will do with a 100gr what the 6mm will do with a 85gr. just like the 270 and elk debate. Is it enough? sure, but you limit yourself and there are better cartridges for the purpose. one big factor is recoil. the 25-06 will kick a little more, if recoil is a issue the 6mm will certainly take deer cleanly. if recoil is'nt an issue then the 25-06 will give you bit better performance.