Help identify these two cartridges?

[Parashooter]

Actually, they're both probably .30/40 Krag. The one on the left likely has its projectile pushed into the neck farther than normal, leading you to mistake a measurement on the ogive for its major diameter. Pull the bullet back out and you might find it's closer to .308". The variation in body taper and shoulder form is normal, since in a rimmed design these dimensions are not especially critical as long as not too large for the chamber.

Here's a SAAMI chamber drawing -



And a comparison of fired and unfired .30/40 cases -