I want to find a straight gripped Marlin 336 and either re-bore or re-barrel to one of these cartridges. I really like the classic 38/55 but like the option of the heavier hitting loads of the 375. I have been hand loading for nearly 20 years so I will probably never fire a factory load. I know the 38/55 has been killing critters for a long time but really want to have the option of more horsepower if I hunt something beside deer. Can the 38/55 SAFELY be stepped up some or should I just go with the 375?