I just got live and my game was updated, and I down loaded dead money, now I just started new charecter, and the first ammo I came across was .223 ammo, after an extensive web search I find references to it but nothing concrete to tell me what weapon it is for, did they change something ,or was something added?? pls answer I am confused

.223 has always been in the game. It did not appear in vendor's ammo lists, but rather in misc as a box of ammo. You can use it in all weapons chambered for 5.56mm, and you get slightly less damage, but also slightly less weapon wear. IRL, commercial .223 ammo is loaded to lower pressures than military 5.56mm. There are a few more differences, but for gameplay's sake, just look at it as a low cost "plinking" round for any 5.56mm weapons.

-Gunny out.

It works on 5.56 ammo guns. It just has negative affects on it. (I think)

Thanks I appreciate the info, I knew about rl usage of the cal. but in game originally it was used by the "that gun", but till I got on live it had never shown up in my game and that is what had confused me, musta been a specific glitch to my game ??? weird ,.... once again tks ,...... no more sleepless night for me lol

When you went on live, it probably updated to the most recent patch. In this patch Josh changed how vednors stock some of the ammo, .223 being one of them. You used to only find it in the vednors' "misc" section, and have to buy it by the box, but it is now in the "ammo" section, where you can buy it a cartridge at a time. I don't think I ever saw ammo drops, from either enemies or loot, give you .223, so unless you bought boxes of the stuff from the vendors that sell it, you wouldn't have seen it in the game at all.

-Gunny out.