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#6110359 - 12/30/15 06:33 PM More beginner questions - over pressure signs
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
Apparently a sign of over pressure is if the primer seems flattened. I just loaded a first batch and they all look like it's flattened. The rounded shoulder is noticeably less rounded than a shot primer. Other than this i don't see anything else from what little I know to look for. The loading was the following:

308 once fired federal gold brass
Cci large rifle primer
Varget 43.0-45.2grn
Hornady 168 Bthp
Seat depth 2.200" from case to ogive (for ref, a federal gold match smk 168 measures 2.225" with the Sam stool set up)

Is this ok, not ok? Did I do something in the grass prep.
I found my landing seems relatively tight. I have to drag my bullets about 0.025" shorter than factory federal. Could that cause this primer flattening?

Any thoughts are appreciated. I'm thinking I don't need to worry about this but please correct me if I'm wrong.

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#6110398 - 12/30/15 06:55 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
pics of bases? load data looks ok
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#6110416 - 12/30/15 07:04 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston


Best one I can take.

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#6110534 - 12/30/15 07:53 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Michael W. Offline
Veteran Tracker

Registered: 11/22/10
Posts: 2692
Loc: Central Texas / Comal County
According to my Nosler book, that is a OK loading. You can go up to 46 grns. A little bit of flattening is not a problem. Watch for cratering around the indentation. I don't see any in your photo.
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#6110592 - 12/30/15 08:20 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
What exactly do u mean by cratering? Meaning the area where the primer is struck, that is actually bulges past the the flat surface of the rest of the primer?

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#6110675 - 12/30/15 09:05 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
I think your good KR.
cratering looks like a ring around the firing pin strike. If you have a reloading manual it should show a pic or maybe google or youtube it.
Chad or Jason should chime in when they find this thread.
Don't over stress it.
_________________________
"I ain't here for a long time, I'm here for a good time"
King George Straight



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#6110835 - 12/30/15 10:23 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
ASIC777 Offline
Woodsman

Registered: 11/30/07
Posts: 212
Loc: McKinney, TX.
Cratering: The primer metal flows back into the void between the firing pin and the bolt face. The appearance will be metal that sticks up above the flat surface of the primer in a ring around the firing pin indentation. I don't see any in your picture.
BTW, its only one of the signs of excess pressure.
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#6110988 - 12/31/15 05:58 AM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6220
Loc: Wise Co.
Cratering is not necessarily a pressure sign, though.
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#6111150 - 12/31/15 08:08 AM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
jeepercreeper Offline
Extreme Tracker

Registered: 11/07/10
Posts: 3642
Loc: DFW
I loaded up some brand new Lapua brass with Federal 210M primers last night. You wanna look at flat primers, LOL. My hand is sore because some of those dang primer pockets were sooooo tight.

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#6111277 - 12/31/15 09:20 AM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Bet I've shot 5000 rounds with minor cratering on each primer.

You have have soft Federal brass, with no extractor mark. If that is the load the rifle likes, run it.
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#6111414 - 12/31/15 10:19 AM Re: More beginner questions - over pressure signs [Re: ASIC777]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
Originally Posted By: ASIC777
Cratering: The primer metal flows back into the void between the firing pin and the bolt face. The appearance will be metal that sticks up above the flat surface of the primer in a ring around the firing pin indentation. I don't see any in your picture.
BTW, its only one of the signs of excess pressure.


best description I've seen without a picture
_________________________
"I ain't here for a long time, I'm here for a good time"
King George Straight



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#6112291 - 12/31/15 07:13 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Michael W. Offline
Veteran Tracker

Registered: 11/22/10
Posts: 2692
Loc: Central Texas / Comal County
Originally Posted By: Korean Redneck
What exactly do u mean by cratering? Meaning the area where the primer is struck, that is actually bulges past the the flat surface of the rest of the primer?


Good description Buzzsaw gave. Here is a photo.

_________________________


A clear conscience is often the sign of a fuzzy memory.

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#6112971 - 01/01/16 09:49 AM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
.243 cases, KR are you overloading your Wife's Savage again?????
_________________________
"I ain't here for a long time, I'm here for a good time"
King George Straight



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#6113130 - 01/01/16 11:41 AM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
The 2 main signs of pressure are sticky bolt lift and shiny spots on the case head from the ejector or bolt face. I don't pay much attention to the primer, honestly.

Primer- different rifles will exhibit various characteristics on the primer. Bolts with a larger firing pin opening will easily show raised edges around the firing pin strike. Bolts with small or no clearance around the firing pin will not show any raised edges. Also, different primers will flatten out easier than others. Standard primers (non-magnum) primers have a thinner cup, and will flatten out easy, even on mild loads. For this reason, I don't pay attention to these signs. (Now, if you are piercing or blowing primers, then yes, that's a sign!!)

Keep your loads within "common sense" powder charges/loads. In this case, the max charge listed is 45.2 grains of Varget with normal FC brass (not military brass with less internal case volume). I know that 46.0 is about max with a 168, as other loading data also lists. So, the powder charge is getting near the max, and is within "common sense" powder charges.

I also look at the speeds on everything I shoot. I know about where the speeds should be on the combination of caliber, bullet and powder I am testing. If you are getting excessive speeds, then maybe a hot load. Also, as you increase your powder charge (I use .3 to .4 grain increments increasing), you will gain speed, about 25-30 fps per .3 grains of powder. Once you reach max pressure, you velocity will level off, and not increase any more. Often times, as you continue to go up in powder charge while at the rifles max pressure, your velocity will go down from the previous loads. This is when I know I'm at pressure and at max speeds I will get with the caliber, bullet and powder combo I am shooting. It is good to know this, so you know where the max.

Everything above is data shooting UNsuppressed! Once you add a suppressor, a lot of things change. A suppressor adds more back pressure, and increases the pressure of a load by about 5000-7000 psi. So a max load shot normal with a suppressor can easily be a over max or hot load with a can. So, test your loads on how you plan to shoot them.
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#6114000 - 01/01/16 07:56 PM Re: More beginner questions - over pressure signs [Re: Korean Redneck]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
flehan

that's a bad reloading dude!!
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"I ain't here for a long time, I'm here for a good time"
King George Straight



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