05-10-2014, 04:03 PM
BjornF16 Wrote:What is the connection between IMR 4064 and AA 4064?
...and is IMR 4064 more temp stable than Varget?
Bjorn:
Not sure about differences in stability or burn characteristics between AA and IMR 4064's. I do know that if you asked ten High Master shooters if they would rather use IMR 4064 or Varget, 9 would choose Varget. IMR4064 had very large granules of powder and was very difficult to meter consistently from powder measures. And, many believed it was too slow for the more popular cartridges. I think this was more myth than fact but when shooters get a notion about something, I won't argue over it. Reloader 15 and Varget meters way better and both seem to be more versatile over a wide range of cartridges and bullets.
4064 was very popular with the 30-06. 46 grains of 4064 if I recall correctly, for the more popular match bullets of the time. Probably because the other choices were too fast or too slow and 4064 gave a greater case fill due to its size.
I would take Reloader 15 over 4064 and Varget over Reloader 15, for any cartridge. But none of them are good for the Grendel due to their lesser bulk density than ball powders.
LR55