Appearently you live near Jarretts shop [img]/ubbthreads/images/graemlins/grin.gif[/img]!!!
The 300 Jarrett is a fine round and Kenny was certainly a pioneer in long range hunting rifles but in my personal opionio, any round from the 300 WSM
up to the 300 RUM will offer the same accuracy potential as the 300 Jarrett as long as the rifles are built correctly with quality dimensioned throats and the ammunition is good quality.
At extreme range, the difference between a 300 WSM and a 300 RUM are really not that extreme and the Jarrett lands right in the middle, well perhaps a bit closer to the RUM end of the performance spectrum.
As far as ballsitic numbers go, the Jarrett is a twin to the 300 Wby and 300 Dakota rounds, nothing more, nothing less. Great performance levels but nothing earth shattering compared to a host of other fine rounds.
What set teh Jarretts apart is the fine rifles, again, any caliber will be very accurate in a quality rifle, I feel anyway.