I am considering purchase of a model 94 in 450 Marlin but have a question regarding frame strength. I own two 94 Big Bores in 375 Winchester. I know that cartridge operated at a factory spec of 52,000 psi and Winchester significantly strengthened the area near the locking. The case has an effective head diameter of .422 inches with a rim diameter of .506 inches. The 450 Marlin operates at a lower, 43,500 psi (if my memory is correct) but is a larger case with an effective diameter (exclusive of the belt) of 0.5121 inches while both the belt and base of the cartridge are 0.532 inches. Even with the lower pressure, the 450 Marlin exerts greater force on the bolt than the 375 Winchester (using the diameter of the effective head diameter rather than the maximum diameter, as the larger parts of the case such as the belt and rim only tend to spread out the force over a larger area). So why is it that the model 94s in 450 Marlin did not need the Big Bore frame modifications while the 375 Winchester did? Has Winchester (Miroku) used a higher strength alloy or has Winchester ultimately determined that the added frame strength was not required after all, or is the 450 Marlin a bit much for the 94 platform?