Punctured Primer

JD · 04-23-2013, 04:44 PM

My Finnish luger will do this with some old S&B ammo that I have. Just a very tiny pinhole in the center of the firing pin indent. Just enough to turn the indent black, but not enough to leak any significant amount of gas into the toggle. Inspecting the firing pin assembly showed minimal powder residue and no damage. Switching to other types of ammo and the problem goes away...

There are no signs of high pressure with the S&B ammo, and actually it seems to be very low pressure with a chronographed velocity of no more than 1000 fps with the 115 grain bullet, and sometimes not quite enough Omph to completely cycle the action...

Leen · 04-24-2013, 03:43 AM

JD I have the same problem. I switched from Lapua ammo to Magtech and then the problems started. I have some S&B ammo and Geco in my safe. So I`ll try the pistol with that this week.

I`ll check every case that comes out of it.

Maby magtech uses verry thin primers.

sheepherder · 04-24-2013, 10:49 AM

This thread reminds me of an old James Bond book I read back in the 60's. Ian Fleming was touted as being firearms-proficient, but he had James as modifying his .25 Beretta by filing the firing pin to a point...

It may be a wild shot (sorry about the pun), but check your firing pin against a good one and make sure the end is rounded and not a pin-point...Some ignorant Bond fan may have 'improved' it...

04-24-2013, 10:49 AM	#3
sheepherder Lifer Lifetime Forum Patron Join Date: Feb 2009 Location: ...on the 'ol Erie Canal... Posts: 8,208 Thanks: 1,425 Thanked 4,474 Times in 2,343 Posts	This thread reminds me of an old James Bond book I read back in the 60's. Ian Fleming was touted as being firearms-proficient, but he had James as modifying his .25 Beretta by filing the firing pin to a point... It may be a wild shot (sorry about the pun), but check your firing pin against a good one and make sure the end is rounded and not a pin-point...Some ignorant Bond fan may have 'improved' it... __________________ I like my coffee the way I like my women... ...Cold and bitter...

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04-23-2013, 04:44 PM	#1
JD User Join Date: Jun 2003 Location: Southern Idaho Posts: 107 Thanks: 58 Thanked 22 Times in 17 Posts	My Finnish luger will do this with some old S&B ammo that I have. Just a very tiny pinhole in the center of the firing pin indent. Just enough to turn the indent black, but not enough to leak any significant amount of gas into the toggle. Inspecting the firing pin assembly showed minimal powder residue and no damage. Switching to other types of ammo and the problem goes away... There are no signs of high pressure with the S&B ammo, and actually it seems to be very low pressure with a chronographed velocity of no more than 1000 fps with the 115 grain bullet, and sometimes not quite enough Omph to completely cycle the action...

04-24-2013, 03:43 AM	#2
Leen User Join Date: Aug 2010 Posts: 17 Thanks: 0 Thanked 0 Times in 0 Posts	JD I have the same problem. I switched from Lapua ammo to Magtech and then the problems started. I have some S&B ammo and Geco in my safe. So I`ll try the pistol with that this week. I`ll check every case that comes out of it. Maby magtech uses verry thin primers.