It is usually high pressure, if rounds are fired quickly cases may show higher pressure, I have noticed similar high pressure signs with M193 ammo.
Too much oil in the bore can cause high pressure, after cleaning run a dry patch through the bore to remove excess oil. Copper fouling or carbon fouling can cause higher pressure.
You may also check the length of the bolt, it should be 2.80, if the bolt is too short the firing pin may protrude too far from the bolt face and pierce the primers or make the primers easier to pierce.
They even make firing pin protrusion gauges but not exactly sure where to find one maybe Brownells.
The thing that bothers me is these are all factory loads and not m193 or is it?
M193 is known to be a little warm but if these are factory loads something in the barrel or chamber is causing the high pressure. If the barrel is clean and still shows pressure like that I would send it back to RRA to have the bore checked unless you happen to have a .218 pin gauge handy.
The 6.8 is the fastest growing cartridge and #1 choice for hunting deer and hogs with an AR15.
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Last edited by Constructor; 04-06-2010 at 02:20..