The 6.5x55. There is a mystique to that round which cannot be matched by many.

I'd take the 280, cuz I don't like metric sized bores.
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The difference in ballistics is what I notice more than anything. Definately more hold-over with the 6.5x55 ... The .280 has a flatter trajectory, and that makes it easier for me. And I love it's effectiveness on game.
Not knocking the .280, but don't you have to shoot the heavier (175 gr) bullets in .280 to match the ballistic co-efficient of the 6.5x55 in the 140-142 gr range?
160 - 162gr in the 280 runs the same sectional density as the 6.5. Not sure on the B.C. for the 6.5 in the 140-142's as I have nerver owned one but the 162gr SST from hornady has a B.C. of .550
The 142 gr SMK in .264 has a claimed SD of .291 and a BC of .595 when pushed at 2,850 fps or better. BC is still .550 when pushed mildly at 2,050 fps. Can't speak for a 162 gr Sierra bullet for the .280 but the 160 gr has an SD of .283 and the BC is less than .475.
What kind of results (penetration, wound channel, weight retention, etc) are you getting with the SMK's?
Not knocking the .280, but don't you have to shoot the heavier (175 gr) bullets in .280 to match the ballistic co-efficient of the 6.5x55 in the 140-142 gr range?
I do like the 6.5x55. It is a good chambering and I would [and have] been happy to hunt with it. If I have to pick between the two, then I'd rather have a .280.



























