|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Today's Posts | Search |
|
Thread Tools | Search this Thread |
August 18, 2013, 10:48 PM | #1 |
Senior Member
Join Date: August 13, 2010
Posts: 429
|
What's going on with these primers?
|
August 18, 2013, 11:16 PM | #2 |
Senior Member
Join Date: January 24, 2009
Location: Anchorage Alaska
Posts: 3,341
|
Mystery. I love a puzzle!
Is it a chip or a dent? That is, is there metal missing out of the primer or is it just dented.
Is the mark always in the same orientation? That is, if you chamber the cartridge with the dash in the "30-06" always at the 12:00 o'clock position, is the mark always in the same orientation? Is there anything on your boltface that could make such a mark? Particularly anything with that orientation to and distance from the firing pin? What steps have you taken to discover if the mark is made before ejection from your action? What action are you shooting, by the way? Bolt action, falling block, sem-auto, etc? Lost Sheep Last edited by Lost Sheep; August 19, 2013 at 01:03 AM. |
August 18, 2013, 11:33 PM | #3 |
Senior Member
Join Date: June 22, 2007
Location: Upper East Tennessee
Posts: 477
|
Looks like the primer is getting a small "ejector mark"...
|
August 19, 2013, 06:19 PM | #4 |
Senior Member
Join Date: February 13, 2006
Location: Washington state
Posts: 15,248
|
Your primers are extruding into the ejector cutout. Coupled with the flattened primers and the extrusion into the firing pin hole, I would call that a pretty stout load.
__________________
Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services |
August 19, 2013, 09:35 PM | #5 |
Senior Member
Join Date: February 15, 2009
Posts: 8,927
|
I also think that load's too hot. Especially when the edge of the primer's very square and sharp; not radiused like normal maximum loads produce.
What's the recipie you're using? |
August 19, 2013, 09:42 PM | #6 |
Senior Member
Join Date: January 2, 2012
Location: Minnesota
Posts: 3,876
|
Curious as to how many times that bass pictured has been reloaded & shot?
|
August 19, 2013, 11:35 PM | #7 |
Senior Member
Join Date: August 13, 2010
Posts: 429
|
The brass is once fired. I bought the brass new as factory loads and this is their first reload.
I thought the primers looked flattened more than usual as well, but the weird thing is this was way under the max load. I tried a couple at the max load and they did look like they were backing out. The load was 49 grains of IMR 4381 an a Hornady 150 grain SP bullet which is a mid range load according to their manual. I did seat it a little longer than what the load data listed. I also tried mid range some loads with Varget and Nosler 150 grain BT bullets and the primers looked the same. |
August 20, 2013, 12:25 AM | #8 | |
Junior member
Join Date: October 4, 2007
Location: All the way to NEBRASKA
Posts: 8,722
|
Quote:
Your primers have lost their radiused edge, the extractor appears to be making a mark on the primer, and the edge of the firing pin dent appears to have flowed into the firing pin hole: that's 3 hints that pressure is higher than it is supposed to be. Then again, it's your gun, and you can beat it if you want to, for whatever reason. |
|
August 20, 2013, 02:33 AM | #9 |
Senior Member
Join Date: May 1, 2009
Location: Burnet, TX
Posts: 727
|
Just as a side note, Federal brass is known to be soft. It's been especially problematic for me in my .223 AR15. It has treated me a little better in my .280 bolt gun. Just something to think of...
__________________
Veteran OEF (2002) and OIF1 (2003) - US Army Member of the Burnet Gun Fighters, Inc. and of course the NRA Oregon State University alum -- Go Beavs! |
August 20, 2013, 07:19 AM | #10 |
Senior Member
Join Date: April 8, 2013
Posts: 539
|
That's the ejector mark on the bolt face. A few things are also going on. It's a picture so cant really tell for sure but, it looks like high pressure by the slight crater around the firing pin strike and over all flattened appearance, yet it also looks like the primer pockets may be a bit oversize as it seems the primer backed out a few thousandths? You may have too heavy a load, in some brass with poor primer pockets.
|
August 20, 2013, 09:58 AM | #11 | |||
Senior Member
Join Date: January 2, 2012
Location: Minnesota
Posts: 3,876
|
I think you may have a few things going that may be the cause of your problem.
Quote:
Quote:
My Speer #11 says 55.0 to 59.0 for imr-4831 and using 150 gr. bullet again my older Hornady 3rd edition stat's are: 56.9 to 60.3 for the same. Something really unusual. IMR's Powder booklet and Hodgdon's web site doesn't even suggest IMR-4831 being used for your bullet weight. And if using Varget it's suggested by IMR's web site to be measured: 47.0 to 51.0 and using a 150 gr. bullet. Quote:
Min: 2.970 Max: 3.340 Shorting powder measurements and extended bullet length preformed on a 30-06 cartridge. I highly doubt your gain all that much tighter groupings. If indeed looking for a little additional accuracy I encourage you to try Neck sizing instead. You may see some improvement in your rifles groupings then S/S |
|||
August 20, 2013, 10:45 AM | #12 |
Senior Member
Join Date: January 4, 2012
Location: Northern Missouri
Posts: 480
|
Best guess: The load is light. Expect the primer it initially set back, then, as the case comes back, the expanded primer is is flattened and marked by the ejector. Is it a Remington? The load is not too heavy, or giving dangerously erratic pressures, because the case itself gets no ejector mark.
|
August 20, 2013, 03:07 PM | #13 |
Staff
Join Date: April 13, 2000
Location: Northern Virginia
Posts: 41,390
|
What gun are you shooting, and what are your loading specifics?
__________________
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower. |
August 20, 2013, 06:57 PM | #14 |
Senior Member
Join Date: July 26, 2011
Location: USA
Posts: 1,730
|
It a light loading. Same thread here > http://www.thehighroad.org/showthread.php?t=726073
|
August 20, 2013, 10:03 PM | #15 | |
Senior Member
Join Date: December 24, 2008
Location: Loveland, CO
Posts: 1,476
|
Quote:
I have found excessive head space to cause flat primers when pressures are normal. The second picture looks more like and indentation, not a high spot. If it was caused by high pressure extruding the primer into the ejector, it would be a high spot. What type rifle are you shooting? Is the ejector the mauser type, or the Remington plunger type?
__________________
NRA Benefactor Life member |
|
|
|