this has probably been beat to death already so my apologies. a dear friend, an old school marine friend of mine passed recently and willed me a new HK 91. i have been trying to find out what ammo should be run thru this and everything I see is the 7.62 NATO round is at a lower pressure than .308 WIN. however a lot of people selling ammo are listing the 7.62 NATO and the .308 WIN as the same round. are they or are they not the same round. any insight would be welcomed and appreciated.