Interesting 1886 and 40-82 loading advice request|Page 2|Winchester Rifles|Forum|Winchester Collector

helidriver72 said
This 86 has a 1” diameter barrel thats 21” long.
i’ve sent for a factory letter
Any advice on loading for it would be appreciated. Its a 40-82 and I’ve ordered dies and 45-90 brass so far.
Also it slam fires if you run the lever hard and wont stay on half cock. Thoughts?
any thoughts on the barrel configuration?
 
https://imgur.com/a/Yf4Iksp
  

I read that prior to 1901 that case hardened actions were standard on the 1886’s. This rifle was manufactured in 1892 according to the serial number. From the pictures would you guys say this is a case hardened action?