Bigrich. There's a famous old shooter under the MRCA that's been range-whoring literally his entire life. There are amazing antique photos of him on the mounds as an 8yr old kid - he lived just around the corner. In his life, he's won all the disciplines, ranging from TR, to SR. He won the SR Queens a couple of times, back when it still formally had the SR component. That's kinda where he got his reputation. Anyways, in short is he's amazingly talented, believe me. I won't name him here, out of respect for his wishes for privacy.
Over the years he's always been a real "experimenter". He's run all kinds of calibers in Service matches, which has generally been limited to 400m and under at Malabar. He loves his two 6.5mm modern guns. He's run a 6.5cm and 6.5x55 many times, and we cannot tell the difference between the two in terms of score - they both literally win the comps, always within a big a field of competitors. Both shoot the same, and that is amazingly well.
I film and spot the vapor trails all the time, and both the 6.5cm and 6.5x55 are amazingly fast and flat. They zip in there more efficiently than the bigger 30cals, and not as random as the little 223 when the wind is fishing about. You can always tell by the lack of horizontal dispersion that they buck the wind better than anything on the mound.
I know the SAAMI spec for the 6.5x55 is only low 50kpsi, but this is based on the old smallring mauser. With good quality brass, you can practically squeeze as much performance out of the 6.5x55 vs the 6.5cm. Buy good brass, anneal, load it up hot and drive'em hard, and you'll hit what you are aiming for mark my words.
The aformentioned old bloke sold all his rifles recently (some of which came to me!!

) except his two 6.5s. And his all time favorite rifle, running handloads, is the honorary 6.5x55mm SAKO (not exactly sure what model?). That thing can f@rkin SHOOT!!
