I know more than one guy who gets 3000fps with the 140gr class of bullets from a 6.5x284. So, that will change your figures.
And I know of more than on guy who gets 3000fps with a 150 out of the 270 so it doesn't change anything realistically. Are you under the impression that only the 6.5x 284 can be pushed hard?
In barrels of equal length pushed to saami specs the velocities of the 140 6.5 x 284 vs the 150 270 are to close to record a difference. Of course we can push either cartridge beyond that limit but to only push the 270 hard and leave the 6.5x284 at saami specs wouldn't seem like an apples to apples comparison.
Shod [/quote]
I know the 142gr matchkings at 3000fps is a common load for 1000yd matches in the 6.5x284. I have NEVER heard of 3000fps with a 150gr 270 bullet. Most guys have problems getting there with 140s. 130gr 270 loads generally run 3100+ fps.
Personally, the one factor no one is mentioning is the higher SD values of the 6.5 mm bullets compared to the 7mm or .277 bullets. That is a bigger factor in game killing than BC values.
