I have a couple of SAUM wildcat finish reamers, but haven't been moved to use them. I have rifles chambered for both the 270 WSM and 7mm SAUM that shoot pretty good groups, so despite being a .264"/6.5mm bore fan, I haven't been moved to cut a new chamber in either a barrel blank or one of the 260 take-off barrels that I've been hording.

How much difference in practical field performance would you expect to get from a 6.5 SAUM vs. either the 270 WSM or 7mm SAUAM?