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NYY
06-30-2011, 10:48 PM
example: XM855 or XM193. Where does the "XM" and these numbers come from/mean? I know 855 has steel penetration/lead core and 193 is original lead core fmj but just curious..

brando
06-30-2011, 11:08 PM
X = experimental

Omega13device
06-30-2011, 11:36 PM
http://www.thegunzone.com/556xm.html

Quiet
06-30-2011, 11:50 PM
I know 855 is steel core and 193 is ball but just curious.

Both the M193 and M855 have lead cores.

M193 = 55gr FMJ (lead core)
M195 [red crimp] = rifle grenade launching blank
M196 [red tip] = 54gr FMJ Tracer
M200 [violet crimp] = training blank
M855 [green tip] = 62gr FMJ (lead core and a steel penetrator)
M855A1 [green tip] = 62gr FMJ (copper core and a steel penetrator)
M856 [orange tip] = 63gr FMJ Tracer
M995 [black tip] = 52gr AP (tungsten carbide penetrator/core)

NYY
07-01-2011, 12:05 AM
awesome! thanks guys appreciate it

brando
07-01-2011, 12:22 AM
http://www.thegunzone.com/556xm.html

Good catch :)

cjc16
07-01-2011, 8:16 AM
look here...http://ammo.ar15.com/ammo/project/perf_xm193mil.html

P08
07-01-2011, 9:05 AM
xm means rejected from the govt contract due to variances from the stated spec. The ammo is a factory second, the reason is rarely publicized(dont assume its for something little).

evidens83
07-01-2011, 9:12 AM
X=extremely
M=manly









:D

docsmileyface
07-01-2011, 9:18 AM
From what I understand the XM stuff packaged in boxes is overrun or didn't meet cosmetic standards, the XM stuff that says "Training use only" is stuff that had some more deeper problems with it - I had some training use only M855 and some of it was waaay hot and would keyhole each shot. Very inconsistent.

qaz5109
07-01-2011, 11:46 AM
X=seconds

Omega13device
07-01-2011, 12:35 PM
It's generally fine for training, though some have had primers pop from Federal XM193. I definitely wouldn't bet my life on any XM ammo, but I'd never use M193 or M855 for self-defense anyway so it's a moot point for me.

Knife Edge
07-01-2011, 1:32 PM
example: XM855 or XM193. Where does the "XM" and these numbers come from/mean? I know 855 is steel core and 193 is ball but just curious.

Siriusly?

NYY
07-01-2011, 1:42 PM
Siriusly?

fixed. *seriously*... you sirius???"

CK_32
07-01-2011, 4:08 PM
X=extremely
M=manly









:D


:rofl2:

CK_32
07-01-2011, 5:46 PM
I was told the x stands for x like no... For not military.

Make since to me. Because it didn't pass standards they put an x next to the m so show its not usable and is just x.... Like a check mark or x for pass or not pass... Because I know if it does pass it stays m193... For military.

I heard rumors it stood for experimental but I doubt that's the case...... I doubt any company would Put their name on experimental ammo. And if it was why is it in full production and been around for years... Experimental parts usually are experimented with for a year or less or are under the radar... So that's debunked.

Either way it shoots great and I'll continue to shoot it at the pics I'm getting it for it's stupid not to.

pipboy
07-01-2011, 5:48 PM
http://www.federalpremium.com/resources/xm193.aspx

The manufacturer claims its first run ammunition not seconds. Says its first run ammunition to "commercial spec" (whatever that means)...As opposed to the M designation for "mil-spec" maybe?

Cen Cal Gunner
07-01-2011, 6:01 PM
what about the XM marked "NOT FOR DUTY USE" I seen at PSA they refer them it as rejects?

Knife Edge
07-01-2011, 6:45 PM
fixed. *seriously*... you sirius???"

Hardly ever. Mostly XM.

blazeaglory
07-01-2011, 8:02 PM
heres another cool site but without the "XM"

http://www.atk.com/capabilities_defense/cs_as_ma_sc_5.56mm.asp

blazeaglory
07-01-2011, 8:16 PM
if you look closely at this can, it is a military can that has been approved and IS NOT marked "not for duty use" but it is still marked XM855...the only difference between the two is that one is marked XM855LC AC1 (not for duty use) and the other is marked XM855LC1 AC1(NATO)...

http://palmettostatearmory.com/2251.php

and the strange thing is, i just ordered a can from Cabelas and it is marked XM855LC1 A2 (NATO)

??

NYY
07-01-2011, 10:26 PM
if you look closely at this can, it is a military can that has been approved and IS NOT marked "not for duty use" but it is still marked XM855...the only difference between the two is that one is marked XM855LC AC1 (not for duty use) and the other is marked XM855LC1 AC1(NATO)...

http://palmettostatearmory.com/2251.php

and the strange thing is, i just ordered a can from Cabelas and it is marked XM855LC1 A2 (NATO)

??

Hmm yea i see. Thats very interesting! So if i may ask, why do you prefer the steel penetrator rounds over regular FMJ?

blazeaglory
07-02-2011, 10:53 AM
Hmm yea i see. Thats very interesting! So if i may ask, why do you prefer the steel penetrator rounds over regular FMJ?

well its kind of stupid reason really...i have a very vivid imagination and picture myself having a shootout from the front of my house with people trying to hide behind their cars shooting back at me...Lol and besides, like my old fiance said "i like the penetrating power". these rounds were bought to stockpile

i would prefer FMJ for maybe a CQ rifle. i dont know. beside they were cheap and came with a free can and stripper clips/guide:D

blazeaglory
07-02-2011, 11:45 AM
i talked to a ammo rep at cabela and he said that the X stands for "extra" as in overrun or rejected.

now the difference is in the "not for duty use" label... the not for duty use are the military rejects but are still OK for civilian use and have passed SAAMI spec but have small blemishes and were not up to the strict milspec.

the cans with NO "not for duty use" but with just a serial number are the milspec overruns that the military did not purchase and are blemish free.

that was his explanation anyways.