The Marlin 336 is a fairly strong action. It was chambered in both the 375 and 356 Winchester cartridges. Both of those cartridges are 50,000-52,000 PSI cartridges. You could load the 35 a little hotter than factory rounds in the 336 but you would not want to put those same loads through the 141. You would have to figure out a way to seperate the ammo so as to not get the wrong ammo in the wrong firearm. Another way to improve it would be to shoot 180 grain cast bullets if you are a reloader. Stay away from the 150 grain bullets as they are not designed for deer sized animals.