@Tahr
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Bob ?.... Is that you Bob ?....Hello... Can you hear me ?...... Bob ?
Sorry....long hot day...couldnt resist.. the .257 is a fine cartridge...
Maybe...I haven't looked at it though thought you could fit more powder in the other 2
With regard to the original post, I think the 708 is the better round at normal hunting ranges for big game. I load for a mates 708 and he shoots 140gr sst's into the same hole and really smacks animals hard. Ballistically you get easy speed whereas with my 260 I feel I'm always looking to push it a bit for speed. The 708 performs better with a short barrel as well.
150gr in 708 would be cool with a long mag fit...I imagine 2750fps could be done at a push. I think someone on here is doing that well with a 7 x 57.
I keep going out to buy a 708 and come back with something different all the time.
2750 FPS is easy in a 24inch barrel and long action or a short action with AI bottom metal and a Accurate mag without a binder plate max col 2.950"
I had 150gr ELD-X going at 2758 FPS (MagnetoSpeed) with a COL of 2.910"
Of course with a 6.5CM you don't have to mess with long action's or mag's without binder plates and machining feed ramps etc, this was all built into the design to work in a Std short action.