Vern,
I compared the 174 gr round nose bullets to the 139 gr soft point bullets that I've been shooting and thought the shape of round nose bullets would overcome some of the .435 jump gap, engage the rifling a bit sooner and possibly shoot straighter.
Too bad I ignored this clue. I probably have a dozen boxes of reloaded 7 mm Mauser with the 139 gr soft point bullets.
Do you still own the Spanish Mauser?
The old box of 20 Remington round noses (with 4 left unfired) is marked $4.75 so it must also be from the 1950s.
Merc