Downwind, I don't know what loads you are using, but I have both a .264 WIN and a 338-06. In the 264, 71grs of H4831 with a 95g HNDY VMAX gives me a solid 3650 fps and 3700 on a warm
day. The 125 NOS PART with 65grs of H4831 gets me 3375fps.
And the 140g NOS PART loves 60.5grs of H4831 at a solid 3000fps. H4831Is the powder in the .264 WIN.
As for the 338-06,H 414 is the final word as powder of choice for all bullet weights.
IMHO.
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