I've never had the pleasure of a 6.5JDJ, but back in my IHMSA days, my contender sported a 10" 6.5TCU and a 14" 6.5TCU. A bunch of 120gr Speers went down range, but the only animal I have a record of was a Wyoming antelope. It fell to a 100gr Hornady. I knew at the time what the velocity of that load was, but it escapes me now. Range was something over 200 yards...
I expect your load in your 6.5JDJ will perform as expected. Don't be terribly surprised if it outperforms your expectation. What is written about it is very high praise, indeed. Enjoy.
Regards,
Sweetwater