OK Matt, lets do education moment. Jump in to follow up if needed..
Steel and the 300 series. The first Schrade made contract 300s were likely 440c bladed. The shortfall came in the design of the liner and after considerable troubles, the Camillus version was created. These two companies shared so much work it sometimes is tricky to know who made what anyway.
When Camillus took over, they were just making pocket knives to be used, abused and discarded. These were knives of the factories, fishing boats, barnyard and other occupations of rough work, 440a was the SS steel of that era. Buck took over the production of the 301,303,309 and 305 BUT the other models stayed at CAMILLUS. Lately, the 307 has been talked up, but is likely just 440a bladed. Others in this category are 313, 311, 319, 317 and 321. A couple more are in the mix also.
Now with Bucks building of the four models named above, they had to pick a SS steel to machine and heat treat. At the time 425M was available but special ordered. Research in-house continued and 420HC was compared with the 425 and it fit the production situation a little better. AND with the special heat treat you had a easy to machine, but with decent good edge holding ability blade.
Later the 312 and 314 were given the 420HC blades also. All those special SMKWs issues were Camilus steel.
420HC Bos method continues to be the steel of the 301,302,303,309 and 305. If we ever get that two blade knife with a clip and warcliff blade goning we can make it an even 6 models...(hint,hint)....
I know several of you guys have studied the situation and have good knowledge of the steel situation, one of the people who comments some on Buck blades is Knarfeng and I respect his statements also.
300