5.56 Nato ID


#1

Hi,

I have the below 5.56 Nato cartridge and haven’t seen one like this before.

I am wondering if this is a plain ball round or if it might be a proof? If it is a plain ball load, why the nickel case?

Any information is appreciated.

Thanks.

Heavyiron


#2

Heavyiron–It is most likely a proof, as you suggested. A nickeled case was the standard military ID for HPT cartridges in 1965. This one was made by Remington Arms.


#3

It is a proof load.


#4

The correct designation for your round is “M197 High Pressure Test (HPT)”. It is identified by its plain tip and silver, as opposed to brass, case.


#5

Here is a link to a nice web page that describes the history and the various standardized rounds for the 5.56 x45, 5.56 NATO and .223, all of which are technically different cartridges.

thegunzone.com/556faq.html#m197


#6

Thank you guys for the information.

Ron, that was a good website.

Heavyiron