I use H335 for my 223/556 loads. 4064 is a stick powder, so on top of it not metering well, good luck getting it through the neck . Plus you're probably going to fill up the case with 4064. Stick with ball powders. I have some Varget but I was saving it for when I work up 308 loads.

Also, I've read that H335 is temp sensitive but I haven't done any testing across seasons yet.