Quoted:
I am not really in on all the hype about the proposed M855 ban, and I only bought a couple cans just to try at some point just in case it becomes extinct. The only other similar ammo I purchased was a case of the Mk18 Mod 0, and with the same intentions. I am sure I overpaid at $449 for a case of 500, but again, how will I ever know how I like(d) it if I don't pull back out the credit card(ugh). Please tell me if I made a bad decision. I only got into ARs because I thought they were going away, and I did the same about the MK18. I love the 3 ARs I now own, and I am looking for opinions on the newly purchased MK18. Will I be disappointed? I have read that it's much more accurate than the green tips, and I don't like to shoot just to hear a loud noise. I DO NOT buy ammo of any kind to sell, so please don't refer to me as a "neckbeard". I just love shooting, and I have an excellent place outdoors to do so.
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I believe from your title you mean MK318 Mod 0.
MK318 is designed for a totally different purpose than M855 and has a different projectile.
MK318 comes in some different flavors.
a) Federal brown box
b) Federal white box
and
c) ammo I believe is constructed from pulled down components by third parties.
(Usually a white box labelled: 62grain OTMRP - Made in the USA to the same specifications as MK318 Mod 0)
Each version performs differently.
Here is a link to Molon's range report comparing the Federal offerings.
MK318 Mod 0 ballistic gelatin results
Generally, it's pretty good stuff as barrier blind rounds go.
I do not believe the .mil is buying it anymore.
No telling if you will be disappointed until you shoot it.
As for what you paid for it,
some people here will think you overpaid, some will ask you where you got it.
ETA: asking people here if you made a bad decision........