I use loads that are actually less pressure than the original 7X57.
That's probably the best course. Some years back they did pressure tests with the 1916 and no issues presented themselves, but downloading .308 is still the safest course. I'd also add that today's 7x57 commercial ammo is considerably less hot than the orginal 7x57 military. I only shoot modern commercial. The rifle is better than most people give credit.