I understood the use on sub caliber cartridges, it was the commercial cartridges that I questioned the use.
I also questioned why WRA used them but UMC did not ??
Did WRA use a more sensitive primer than UMC ? WRA is clearly copper while the UMC is brass.
WRA never owned USCCo., National Lead owned USCCo. entirely from 1919-1920 until 1931. The operation was moved from Lowell to New Haven in 1926. National Lead would not or could not continue to lease the Lowell factory from the Butler/Ames family. They leased unused floor space from WRA, who agreed to manufacture, but not sell USCCo. products.
The sharing of components between the two company’s lines would make good business sense, esp. during the Depression.
Witness bullets marked “W” and “S” on the two company’s products.
When WRA went into receivership and was acquired by Frank Olin in 1931, WRA/Wetsern continued to mfg. USCCo. products.
This is evident by the patents on later USCCo. Copperhead Speedsters( black and gold boxes) and Climax shotshells (red hulls)
The patents are registered to John Olin and Western Ctg.
National Lead dissolved USCCo. as a Massachusetts corporation in 1936. The same year that Olin exercised a clause in the WRA/Nation Lead contract and purchased all the remaining rights to name and patents of USCCo.
Dave-Thanks for the h/s shot