Would you share your minimum and max on that 4064, hard time finding data but have plenty of it, and a couple boxes of 80 ttsx'sI load the Barnes 80 gr TTSX using IMR 4064 in my Tikka 243 Win. What I did was bought a box of Barnes Vor-tex factory ammo in this same bullet to make sure they shot well and then spent a lot of time working up a load for it.
I had a lot of 4064 on my shelf so that is what I used and my final result is very good and a little more velocity than the Barnes factory ammunition. I could not find much load data using this bullet with 4064 so I started low and worked my way up.
Folks, if your 243 won't shoot IMR4064 there is a problem ...........
Not that there aren't other options, but it has proven itself over the years to be the "go to" powder for the 243.