well tbf to the 270, it can within its limites go quite a bit faster, whilst that sounds pretty fast for a 6.5 creed.
However if the 6,5 creed just wanted to match a 130 grn 270 bullet of the same type sd and bc wise, it could likely go down to about 115 grn, and then it might suddenly indeed not be that far behind in terms of speed. However in doing so it would loose its advantage over distance, and it would of course carry less mass and surface area too.
But again, in all this talk of speed, and one cartridge being superior vs another, i think we tend to forget just how quickly speed is lost and energy shed.
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this is a 308 and 3006 shooting the same projectile. The 06 starts out faster and more powerful, of course, but going by the numbers is does exactly what the 308 does, physically, just 45 to 50 meter further down the line. Nothing more than that. And it's a bit the same with the other 06 case capacity family cartridges vs the 08s, x55s or x57s, - using the same bullet they do pretty much the same, physically, just with 25-45 meters difference or so. So even if one subscribes to the "speed is king " theory for terminal ballistics, that extra speed that a lot of the often called "quick cartridges" has, is only really carried for a further 30 or 40 meters, vs the "slower or normal" cartridges of the same caliber.