I recently got a Marlin 336 in 38-55. It’s a great cartridge for long range as well as straight wall cartridge hunting. I’ve slugged the barrel on my Marlin, it measured out at .380. I’ve shoot gas checked lead bullets from .380 to .377 all with great accuracy out of the rifle. I’m getting 1-1/2” to 2” groups at 100 yards with iron sights from a sand bag rest. The point is how well a rifle performs is dependent on knowing the specs of rifle and experimenting with varying loads and bullets. Best of luck, it’s a rewarding journey.