Hank - I prefer the Sellier and Bellot (S&B) 196 grain cutted edge soft point for all my 8mm work and I throw that from my M48A and from a VZ-24/52 with excellent results. The M48A is primarily a field piece and still wears its open sights - somewhat enhanced though with a Swede front post and an opened up rear leaf. The rifle groups under 2" at 100 yds with that load and it is inexpensive enough to stock up a good supply.
I think I might, someday, begin reloading the 8mm but doubt I will drop below the 196-200 gn level and some of the loading data from Vihta Vhoury Oy gives me the indication the 8mm can be a reloading fool's dream.
To me, given bore diameter and bullet weight comparisons, the 185 gn 8mm is on par with the 30-06 sporting a 165 gn bullet and that loading down the 8mm with lighter weight bullets at lower velocities simply doesn't do the cartridge, or hunter, any great favors. But, that being said, I would think that if you are firm in your determination to use the 185 gn bullet it should suffice for Elk if you make sure it's moving out to around 27-2800'/sec, which is what a 308 with a 165 gn bullet will do and they call that an Elk cartridge to 2 or 300 yds.
I don't think the 8mm gives up anything to the 30-06 and certainly not to the 308, as long as it is properly loaded but the operational word here is 'properly', meaning to outperform the 308 and be on par with the 30-06. But, this is just my dos centavos worth. Mikey.