The add on to the lever is removable. When I received it there was black electrical tape wound around it, presuming it was “custom fit” to great-grandpa Wilson’s hand. He was apparently rather small of stature. I have photos of him with the King’s Mill rifle club. He worked at Peters ammunition company and mention of the Wilson family name is in the Peters history book my mom stumbled on. He was her maternal grandfather.

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One fellow in that thread reports Stevens cataloged the originals in 30-40, so I'd think that's good enough. 

However, for what load did they intend? The modern SAAMI rating is hot and appears to be based on the later military loads, the loads which cracked some service rifles.

The original sporting load is 220 RN at 2000 fps from a 30" barrel. Whelen's WW-I era book listed that, and it was written after the #52 catalog cited. 

Working from Lyman's data, I estimated that with 4895 one would be running around 34,000 psi. This is the load I use in my Lone Star rolling block. It's 35 gr over Remington 9-1/2 primers to send the Hornady bullet to 2000 fps from my 30" barrel.

Perhaps Tom Rowe will shed some light on the subject in his upcoming? Stevens book, but considering a lack of factory records makes it difficult to come up with anything definitive it would seem.