Sounds ammo related to me. The IMI that I have shot seemed hot to me, and wasn't very accurate in my rifle. I know some have had success with it, but not me when I tried it. Purely unscientific observation on my part, but that's my impression of it.
Sounds ammo related to me. The IMI that I have shot seemed hot to me, and wasn't very accurate in my rifle. I know some have had success with it, but not me when I tried it. Purely unscientific observation on my part, but that's my impression of it.
To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
The can pin Area sucks. If they get in there, the gun can be completely locked up.
Aren't the primers crimped on that IMI ammo? Most of their product line has crimped primers. It was my understanding a stray primer is a result of loose primer pockets whereas a popped/pierced primer is indicative of overpressure. One can experience stray primers without having pressure issues but I agree some of the IMI ammo seems fairly hot.
Last edited by Eric D.; 07-06-17 at 17:50.
B.A.S. Mechanical Engineering Technology
Primers pop out when there is less case support by the bolt face with the residual casing pressure blowing them out for their tension and a casing head distortion situations that reduce the proper tension between them. Higher peak pressures do not help this.
There's a few things that we can look at here, and a few remedies.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
While that blown primer probably has an an ammo component to it, I would bet that Ned's reamer would fix it.
"Guns are like neurosurgeons. When you need one, you need one badly."
I've ordered one of Ned Christiansen's 223/556 chamber gage to check the chamber. Will go from there depending on what I find out. Thanks to all on this thread for your info and shared knowledge.
NC
I tested the barrel with the Ned Christiansen gauge and I thought the chamber might be slightly on the tight side. I sent the barrel (entire upper) to the manufacturer for their inspection. The manufacturer felt the chamber was within spec. They also test fired it using IMI M193 that I supplied from the same lot, as well as Federal XM193 and had no failures either suppressed or unsuppressed. I have since checked another 11.5 " barrel chamber and the gauge was snug in that one also. I have had no issues with this barrel when running suppressed.
I fired approx 100 rounds of GECO 223, CBC M193 and CBC 62 gr 556 suppressed without issue. All of this ammo was fed from Gen 3 PMAGS. Perhaps one bad round is what I encountered. I will continue testing the upper suppressed and try out some CBC 556 77 gr OTM and BH 556 77 gr OTM or TMK and see how it performs.
As a side: Manufacturer was very good to work with on this issue. I had a good conversation with the owner (I think) about the testing they did. At this point, I guess I'll feel comfortable with the upper if I can get 1K+ through it suppressed without issue.
NC
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