View Poll Results: What caused the primers on the right to leak?
Plugged flame channel
1
10.00%
Plugged flash hole
1
10.00%
Flash hole too large
1
10.00%
Primer too tight i.e. head space too small
0
0%
Primer too loose i.e. head space too large
4
40.00%
Flame channel too small
0
0%
Flame channel too large`
2
20.00%
Flash hole too small
0
0%
Too much powder
0
0%
Ambient temperature too high
1
10.00%
Voters: 10. You may not vote on this poll
Leaking Primers
05-06-2015, 07:00 AM
#1
Nontypical Buck
Thread Starter
Join Date: Aug 2008
Location: Rapid City, South Dakota
Posts: 3,732
Leaking Primers
Rifle is 45 caliber Omega. First shot was from a cold clean barrel. Primers were used in the 'Shoot the Gong' thread. Load was 115g Blackhorn, 200g Shockwave, Harvester light blue sabot, SST primer. The breech plug has had the flame channel enlarged to 5/32". An o-ring was used in the primer seat. The flash hole was/is 0.032" .
05-06-2015, 09:58 AM
#5
Giant Nontypical
Join Date: Mar 2010
Posts: 5,605
As you can see 115grV of BH209 makes very low pressure in a 45cal and a 200gr sabot load.
This is 85gr by weight or slightly over 120gr by volume. The trace was done in a Savage Pacnor45 using a Savage breach plug.
I did not check any of the options since it does not have one possible option. Primer pocket is slightly over sized or simply not supporting the area near the rim of the primer enough. Ive shot many many loads that are nearly double that PSI and ive never had a Fed209 or Win209 primer look like that.
This is 85gr by weight or slightly over 120gr by volume. The trace was done in a Savage Pacnor45 using a Savage breach plug.
I did not check any of the options since it does not have one possible option. Primer pocket is slightly over sized or simply not supporting the area near the rim of the primer enough. Ive shot many many loads that are nearly double that PSI and ive never had a Fed209 or Win209 primer look like that.
Last edited by Gm54-120; 05-06-2015 at 10:00 AM.
05-06-2015, 02:11 PM
#8
Boone & Crockett
Join Date: Aug 2004
Location: Idaho
Posts: 11,703
I am wondering what primer are those and are they Mag primers? I did not think you used Mag primers so they are probably not.
Besides the leaking I look at the primers and notice the dis-coloration of the battery cups. They appear to have gotten very hot and even stressed in the area of tip of the anvil to the bottom of the actual primer, actually from the anvil all the way up battery cup.
So my first thoughts are excessive back pressure. Or another thought is that the hot primer gas could not vent properly (or fast enough) through the BP & Flash Hole. I might actually exect that if they were mags.
Besides the leaking I look at the primers and notice the dis-coloration of the battery cups. They appear to have gotten very hot and even stressed in the area of tip of the anvil to the bottom of the actual primer, actually from the anvil all the way up battery cup.
So my first thoughts are excessive back pressure. Or another thought is that the hot primer gas could not vent properly (or fast enough) through the BP & Flash Hole. I might actually exect that if they were mags.
05-06-2015, 04:32 PM
#10
Fork Horn
Join Date: Feb 2011
Posts: 428
They do look like to much back pressure. As gm54-120 said I've shoot pressure over that in SML 45cal and never had that in the primers I use CCI 209M. I have had some look like that in a knight 1-30 twist 45cal shooting BH 120grV and 250gr sabotless I just took it as to much back pressure. and the head spacing was good with .004 crush on primer and temp was 51deg .
Last edited by a1smokepole; 05-06-2015 at 05:11 PM.