4064 is okay but honestly I prefer much slower powders in my .243 (a savage 99, not at all the same kind of gun of course). What range you shooting at? Your 1:9 twist should stabilize the 105 grain hornady amax and bthp bullets as well as the 105 berger if I'm not mistaken...the bcs of those bullets are in the .5-.53 range. Hodgdon's load data shows very high velocities with the new IMR 7977 Enduron powder, and my own experience has been that, despite it's unconventionally slow burn rate, IMR 7828 works well with the heaviest bullets of this caliber. With those 105s at full speed you have .300 magnum trajectory (duplicates the external ballistics of the typical high bc 168-190 grain loads) with minimal muzzle jump and no and I mean no abuse to the shoulder, no shooters fatigue. For an economical all purpose load, I really like the Speer 100 grain BTSP...it's been really accurate and inexpensive, has shot well with Superformance, 4350, RL19, and 7828. I have not used Nosler's Varmageddon bullets in 55 or 70 grain, but have used them in a .220 swift and they are accurate and also very affordable and again are totally appropriate for plinking but also can be used (as they were intended) for varminting. The 87 VMAX should be great as well, but I have no experience with it.