77mm = 0.000077km
77mm equals 3 inches.
You can find tomahawk ammo by searching through undead bodies when they are dead, and by going to boxes which refill your ammo.
77mm is 3.03 inches.
77mm is greater.
77mm
Ammo-18-dl
8 cm
Ask at your local gun shop where you purchase your ammo.
You will have to contact Marlin to find out.
It seems this caliber is slowly fading. I get mine from Able Ammo.
You can find lots of ammo for laser rifles (microfusion cells), on dead enclave soldiers. If you run around in Washington D.C., you should find bands of soldiers. Kill them and take their ammo. If you go to the brotherhood of steel citidel, in the armory you can buy ammo from the girl down in the laboratory. Hope this helps.