doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Non-corrosive shotgun primer introduction

It took some looking, and this appears to be the best (unverified) information from a Forum post
https://www.mdshooters.com/threads/dating-winchester-western-non-corrosive-primer-boxes.178168/

Reminton acquired the technology for non-corrosive lead styphanate primers from RWS (Rheinisch Westfälische Sprengstoff-Actien-Gesellschaft) in 1926 and introduced the Klean-Bore shells sometime thereafter

This is a 1936 ad specifically mentioning the non-corrosive priming



I found mention of a Winchester 'NF' non-fulminate primer possibly developed c. 23' or 24' but couldn't confirm, or if these were for shotshells.

The Staynless non-mercuric non-corrosive primers were introduced for shotshells c. 28' - 29'

1939 ad mentioning the non-corrosive primers



I've owned 4 pre-1913 Smiths; a 06' No. 00 12g and No. 0E 16g Smith, a 07' No. 2E 16g, and a 08' No. 00E 20g; and c. 1920s Ithaca, Fox and Parker doubles. All were certainly using guns, but not abused and by the bore size and wall thicknesses appeared to have non-modified barrels. They all had "frosting" and superficial pitting, and one gun had to my eye and bore scope significant ragged pits.

Syracuse Arms Co. barrel cleaned but no attempt to polish; breech left and you can see the transition line from the forcing cone



Looking toward the breech of another gun with typical superficial pitting



Worse forcing cone pitting, looking toward the muzzle



Post-1913 Smith chamber pitting




SO it continues to be MHO that any pre-mid-1920s shotgun that had much use is very unlikely to have a 'mirror bore', but I could be wrong. And pics thereof would be great.
Safe queens, and those owned by someone with OCD maybe not