If a student shoots M193 ammunition in a carbine, with a .223 Wylde chamber and carbine length gas system, it is not unusual to see popped primers. A few turns with a standard 5.56mm chamber reamer, designed to lengthen the free bore, will resolve the pressure issue, but accuracy drops off with 68g and 80g loads at 300 yards.
Winchester Q3131A made in Israel is noticeably hotter than Q3131 made in CONUS.
Last edited by T2C; 06-16-22 at 16:44.
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Last edited by markm; 06-16-22 at 17:17.
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Accuracy will drop off with everything after getting honked out to a 5.56 chamber.
There will never come a day when some goofball at a range pulls out a reamer and thinks he is going to work on one of MY chambers to 'help me out'.
The easy solution to over pressure? Don't load the ammo so hot.
I am referring to Federal M193 55g FMJ. It chronographs at 3,180 fps out of one of my RRA carbines with 16" barrel and Wylde chamber. The same ammunition chronographs at 3,056 fps out of an Armalite carbine with 16" barrel with 5.56mm chamber. Federal M193 chronographed at 2,964 fps out of my Colt 6920 carbine.
I did not chronograph the South African M193 I shot. The South African M193 was noticeably less accurate at 300 yards than the Federal M193 and Winchester Q3131 ammunition.
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