This can opener should open any food can easily. As for the ammo can, this should be able to open the metal ammo can you mentioned. Basically, as long as the can has a "lip" or rim around the top of the can that the can opener can hook onto and the can material isn't much thicker than a regular food can this opener should open the ammo can.
yes they can there is a small opener notch that will do the trick. I got my first one from my dad in '64 carried it through Vietnam, and gave it to my son in '90 for him to use on a camp out.... needless to say, he lost it. they are called p-51's they will open any can any time.....:)
From Wikipedia; One technical explanation for the origin of the name is that the P-38 is approximately 38 mm (1.5 in) long. This explanation also holds for the P-51, which measures approximately 51 mm (2.0 in) in length.
Pull the pointed blade out where it's at a 45 degree angle, place the pointed tip on top of the can next to the rim and you'll notice that the slot under the pointed blade fits right around the rim. From there press the point down in a clockwise motion into the top of the can. Once you've penetrated it and brought the point back up to the starting position, rotate the can counter clockwise, or pull the opener back just enough to make another cut in the same fashion. Continue to do that around the rim until the can is opened...be careful (!) the lid on the can will be extra shop using this type of device. Hope this helps, wish I could attach pictures.
Most companies selling this product offer free shipping on this listing. You should not have to pay for shipping unless you are requesting a special shipping method. I hope this answers your question.
Lynum Gadget Supply
I'm age 63, and I have joint pain, BUT, I can still use my little can opener. Each person who has problems with their hands might be different. I say buy one and try it, if it causes you pain to use it give it to a family member. They are so reasonable it would be worth the money. I really love them, I carry one in my purse on my key ring.
I hope that helps you! Lady Survivalist -