Fremont, IMR7828 would be on my list of powders to try in a .264 WM, especially since is seems to be one of the few slow burning powders currently available in my area. Muggie mentioned some very promising powders as well, but I haven't seen any of them on a shelf in at least a year.

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell