Marlin Model 336
This is an improvement of the Model 36 with a new type of bolt (round instead of "square"), an improved extractor and cartridge carrier.
Marlin has modified the Model 336 over the years to take various large-caliber cartridges and renamed it in accordance with those cartridges... i.e. Model 444, Model 1895 (SS, G, GS, Cowboy, etc.) It has proven a good design.