One thing that I have always been curious about regarding the H110/296 and 231/HP38 powders is whether the powders received by Winchester in the East Alton plant were blended further or given additional processing (deterrent coatings) at the East Alton plant. Or were they loaded into cartridges directly from the barrels they were shipped in. Likewise, did any blending occur before the powder was put in the containers for retail sale. If there was no processing at East Alton it could mean that they were blended at St. Marks to the burning characteristics desired by Winchester. However, communications from other posters seems to indicate that this did not occur.

So, does anyone here have first hand knowledge about how East Alton may have processed the powder they received before either packaging it for sale or loading it into cartridges?