Couldn't help myself. I picked up a 6.5X55 Swede case at the range the other day. Long neck, skinny waist, ok if you like that sort of thing
so i looked at it and thought, now that would make a nice 6mm case so i necked it down and seated a 75gr vmax to 2.800" so it would feed out of a standard medium action. Damn it looks good, if you had an improved chamber cut i reckon you'd get 3400-3500fps out of a modern action, probably comparable to the 6 mm rem
here it is next to a .243 loaded with the same 75gr vmax, the swede case is 2.815 COAL, to fit in a tikka med mag.
Chronos