Looking at that circa 2006 report from the cartridge guide made me smile Rob. I don't shoot PRS (or rather any of the the UK equivalents) being a traditional gravel belly type (F-Class in my case), but if I did, I've not the slightest doubt that up against George Gardiner, Terry Cross, and David Tubb, a snowflake in hell would have a better chance than me! ..... and which of the 10 or whatever cartridges they or I chose wouldn't make the least difference to my chances. ( .......... unless they all opted for .22LR of course!)
David isn't really a prs shooter but does pretty darn well when he does.
Ironically the old post talks about George and the 243 when it was his shop that really launched the 6mm creed imo.