I could be WWWAAYYY off, but to me the 6.5 SLR is almost the same as a 260 Ackley??? Correct me if I'm wrong.
Almost...the difference is the 40degree ackley is blown out,...short neck,but the Slr is squeezed down...long neck. The shoulder angle obviously 30 degrees and less boiler room than the Ackley.
Back to rounds down range.... first barrel was still shooting strong over 2500.... season ended.