especially out here in the west
That was a bad statement on my part. Actually, concerns were handloading shot shells for sportsmen all over the country. In the book
The Encyclopedia of Shotgun Shell Boxes by Ted and David Bacyk, the section on handloaded shells goes from page 39 to 61, six boxes per page. Cities represented are New York City; Boston, MA; Philadelphia, PA; St. Paul, MN; Syracuse, NY; Albany, NY; Baltimore, MD; Hartford, CT; St. Joseph, MO; Oakland, NJ; Nashua, NH; Leavenworth, KS; San Francisco, CA; Sacramento, CA; New Haven, CT; Pittsburg, PA; Noblesville, IN; Columbus, OH; San Diego, CA; Allentown, PA; Chicago, IL; Grand Rapids, MI; Troy, NY; Minneapolis, MN; Seattle, WA; Spokane, WA; Los Angles, CA; Portland, OR; Dubuque, IA; Denver, CO; Duluth, MN; Peoria, IL; Cincinnati, OH; Kansas City, MO; St Louis, MO; Colebrook, CT; Accord, MA; Meriden, CT; Omaha, NE; Kenvil, NJ; Carlinville, IL; Swanton, VT; and Chambersburg, PA. There were probably a lot more. Several of the ones I mentioned above weren't in that book.
Local loaders were so common, that the big ammunition companies had different headstamps on their NPEs then they did their factory loaded shells. Winchester had their name and LEADER or REPEATER on their factory loaded smokeless powder ammo --
but put 1901 and LEADER or REPEATER on their NPEs --
For Union Metallic Cartridge Co. their black powder shell was the NEW CLUB, their low brass smokeless powder shell was NITRO CLUB and their high brass smokeless powder shell was ARROW. Their NPEs for black powder were headstamped UNION. Their low brass NPEs for smokeless powder were headstamped CHALLENGE for bulk powders, or MONARCH for dense smokeless powders. Their High brass NPEs for smokeless powder were headstamped EXPERT for bulk powders, or ACME for dense smokeless powders.