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Posted: 7/14/2003 6:26:01 PM EDT
After my KB at Bulletfest I started looking at my ammo more and more. Has anyone heard anything bad about Lot 6, 01 man. XM193? It seems to be a bit "hot" and is shooting pretty consistant fireballs out of my Bushy 16". I chrono'ed some of it yesterday and it's running about 3150 fps. My other concern is the 2 spent primers I found in my lower ( thanks again Campy!! ).
Link Posted: 7/14/2003 6:38:32 PM EDT
3150 seems on par for M193 out of a 16"er. And Flash should be expected for relatively hot ammo. Do you have a Flash hider or brake?
Link Posted: 7/14/2003 6:42:38 PM EDT
Add: If there were anything wrong with lot 6, we would definitely know about it on this site!
Link Posted: 7/14/2003 6:51:13 PM EDT
The 3150 fps velocity sounds about normal from a 16" barrel. I certainly don't see anything near dangerous levels. The XM193 doesn't use any flash inhibitor like some of the other loads (for instance SA M193 has hardly no flash and the Q3131A also has less flash than the Federal. So long as it isn't fired through a tight match chamber I don't see where it would be a problem. But anything can and will happen as Murphy rears his head sometimes. If a few really hot or otherwise defective loads get loose, anything can happen. It occurs with all manufacturers eventually. But with a mil-spec chamber such as Bushmaster, I just don't see why this ammo would be a problem. Did your Kb occur with this carbine or a different gun? -Charging Handle
Link Posted: 7/14/2003 7:11:40 PM EDT
[Last Edit: 7/14/2003 7:15:52 PM EDT by Pure_Energy]
KB was in my Bushy DCM. And no flash hider or brake on the carbine.
Link Posted: 7/15/2003 10:52:03 AM EDT
Link Posted: 7/15/2003 12:32:30 PM EDT
Originally Posted By Troy: You should NOT be using 5.56 loads in your DCM gun, which has the tighter ".223" match chamber. 5.56 loads such as M193 and M855 are at (sometimes slightly over) max SAAMI pressures [b]when fired from a 5.56 chamber[/b]. When fired from a .223 chamber, pressures go up even further, creating extraction problems at best, and in rare instances, even kB!s. -Troy
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Troy hits it on the head here. This should explain your primer problems rather directly.
Link Posted: 7/28/2003 12:09:28 PM EDT
Troy is right on the mark with his advice concerning not using NATO spec ammo in .223 chambered barrels. I had a similar problem with a Armalite AR15c2 that generated blown primers and extraction problems when mx193 or 3131Q ammo was used. Federal American Eagle .223 worked fine. It took a new RRA barrel that has a 5.56 NATO chamber to fix it so I could shoot all types.
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