That's one observation, I guess.
What were the actual velocities leaving the barrel? Or are you just assuming it based on your dope from each rifle? Unless you are 1000% certain that both of your rifles hold the same zero and that both scopes track straight n true, then you can't judge velocity based on your findings alone.
Now, if you strapped a magneto speed chrono to each and provided raw data, that would be different.
However, there are other factors that affect mv. You say both barrels are the same, same mfr, etc. But some bores run tighter than others, and a tighter bore, by even just a few ten thousandths, will also result in more velocity.
The 6.5cm is a nice chambering, especially for those that don't reload, but it's not a replacement for the 260 by any means, and my 26" krieger-barreled savage 260 runs faster than any 6.5 creed I know, showing hornady 140s running at 2925-2950 through my magneto speed, and my dope is either showing higher velocity or I need to check tracking again, as my POI is high compared to my dope, all the way out to 1200 yards.
That velocity was achieved using 43.2gr h4350, btw, and it takes 2.2mils from a 100yd zero to get to 500 at 2500asl.
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