Ahhhh!!!! Anytime the name Herter's pops up anywhere I take interest. I'm a Ol' Herters 'junkie', devoured the Ol' catolog when I was kid from front to back every year from around '62 when my Dad started getting it untill they closed up. I only lived a little over an hours drive from the old store in Waseca, Minn. so after around 1970 or so, it was always a fun drive to head up there from Iowa on a Sat or Sunday afternoon. Found a catalog of '62 vintige in a junk shop, fun to read.
Ref the Herter powder, if I remember right, I think I read it was made in Scotland, a poster on CastBoolits stated he thought Sweden. Whatever, I typed "Herters Smokeless Powders" into thee ol computor and alot of .comm's came up with alot of info. Check out Gunloads and CastBoolits.com's-seems to be alot of posts referring to Herters powders and your 162 and 164.
Would be fun to load up 'thee ol gang' in a time machine and make another trip up to Herters. A forerunner of Cabela's, Gander Mountian, and others. Glad I was born at the time I was to enjoy all the "World Famous" and "Model Perfect" items they had for sale and to read about all the 'tenderfoot' and "city slicker" items and products to avoid!!! Wish they hadn't closed!!!