855 & 193 , whats the difference?

[Pappabear]

Teach me something. What are the specs on the M855 and XXX193 Ammo. I saw a thread on, what do the letters mean and someone replied, it is the packaging that is different. Like 20 round boxes or 200 round boxes etc.

What are the most common type NATO ammo referred to and how are they different? I hear mostly about 855 and 193, anything else? MK stuff? MK262?

Thanks, just trying to put the pieces together.

[R.P.]

855 is 62 grain
193 is 55 grain
Mk262 is 77 grain
That's all I know but that's a start.

[Oscar 319]

Start here:

http://en.wikipedia.org/wiki/5.56x45mm_NATO#Military_cartridge_types

[Pappabear]

Start here:

http://en.wikipedia.org/wiki/5.56x45mm_NATO#Military_cartridge_types


thanks, read it- got it.