Recently, I posted about a light primer strike issue I am having with my Boswell hammerless 12g gun. It has been occurring on a fairly regular basis using different brands of factory 28 g trap loads and reloads using NSI primers in straight wall hulls. Today, I fired 50 of the original Winchester AA compression formed reloads using Win. 209 primers without a misfire. Previously all misfires have happened when using the wider NSI (nobel sport) primers which suit Winchester straight wall hulls as the Win 209 primers are not wide enough to insert correctly in these hulls. The Win 209's are a snug fit in the older, compression formed hulls only.
It appears that my early 1950's vintage gun, which has just had new springs fitted and has adequate firing pin extension from the breech face and is not off face, will only function using the older type AA hulls with the Win 209 primers. The indentation made by the firing pin on the Win 209 primers is certainly more pronounced than the Nobel Sport and most other straight wall hulls on the market.
