1957-1958 from what i can find im about to give mine an overhaul its in bad shape.
Mossberg model 346 KB
60's-80's
around 180-220
Mercury model KB-!A motors where made in 1941. This model was known as the Deluxe comet.
Kb = 3.8 10-10
We would use a modified or full choke, and #4 shot.
The relationship between Ka and Kb values is that they are related by the equation Kw Ka Kb, where Kw is the ion product of water. If you know the Kb value, you can determine the Ka value by rearranging the equation to solve for Ka.
The Kb value for the conjugate base CN- (cyanide ion) is 2.5 x 10^-5.
Kb = 55 It is a very strong base therefore it completely dissociates.
No published sn vale; 15-125 USD or so
I will buy one (395K 12 guage) top price as i have one from my father that is broken, even parts would be great, especially stock. LarryAndy@aol.com