Our time travel has just landed us in Cuba during the Spanish-American War. July 1898..
Teddy Roosevelt thinks we are touched in the head, so we have been assigned mule skinner duties with the supply company.
We are ordered to go down the the beach head and get ammunition for the US Volunteer Cavalry's Krag carbines. Which is called 30 Caliber US Army at this time.
But, Col Roosevelt also orders us to bring back a couple of crates of ammo for the US Marines and Naval landing party members who hold a nearby position.
What type (caliber) of ammuntion will the Marines and Navy guys need?