Blown primer xm193

AR-15 » Ammunition

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Posted: 8/21/2004 6:57:56 PM EDT

Went to the range today, I have a Bushmaster Varminter and was shooting xm193, lot 36/42 ammo. Bolt would not close all the way after firing a round. Upon close examination there was a crushed primer between the bolt face and chamber. I couldn't find the round that had the missing primer. Any thoughts on why it did it? I had this happen 2 weeks ago also. The M4 upper I have had no problems at all.

Posted: 8/21/2004 8:55:09 PM EDT

[#1]

It's because your Varminter has a match chamber, which is tighter and causes this already hot-loaded ammo to create even higher chamber pressures. That's why 5.56 loads aren't recommended for .223/match-chambered rifles. SAAMI specifically warns against it.

Please read this: Ammo Oracle

-Troy

Posted: 8/22/2004 8:38:37 AM EDT

[#2]

Wow. This is a weekly topic!

Posted: 8/22/2004 10:06:11 AM EDT

[#3]

Yep, it is. It's not surprising though considering all the chamber variations, ammo differences and the fact many people don't know all the differences between them. But it usually doesn't take long to find out after a trip to the range.

Posted: 8/22/2004 5:56:16 PM EDT

[#4]

Oh, thats' why. hock.gif Thanks for the reply. Besides the occasional primer, 2 out of approx 1000 rounds of 5.56 is there any additonal risks?

Posted: 8/23/2004 1:25:15 AM EDT

[#5]

Please read the linked document above.

-Troy

[ARCHIVED THREAD] - Blown primer xm193

AR-15 » Ammunition

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