I used Fed 215 LR magnum primers with these loads today. I'm going back to LR standard primers. Although my SD was only 13 for the one load I chrono'd today, accuracy was abysmal.
These bullets were chrono'd at 2372fps. They were used soley for fireforming as I didn't expect them to be very accurate in this barrel.
You are probably a pioneer of sorts with your work on the loading of the 360. That's some good velocity for the amount of powder. That's in the 358 Win camp right ?