Pressure sign on primer (with pic)
- Thread starter Icefire
- Start date
Missing Something
Regular
Looks all OK to me...
When you have the entire primer flattened then you may have problems.
just my 2 cents....
Case on the left is normal. Primer fully seated and nicely rounded edges to the primer and a slight valley around the primer.
Case on the right is a slight sign of pressure. Flattened out primer, little to no valley around primer. Very flat and level with back of case.
A severe pressure problem would show these signs as well as a firing pin dent being pushed back out, or blown primer pocket (gas leak) or ruptured firing pin dent. (Not to mention case sticking in chamber)
When you have the entire primer flattened then you may have problems.
just my 2 cents....
Case on the left is normal. Primer fully seated and nicely rounded edges to the primer and a slight valley around the primer.
Case on the right is a slight sign of pressure. Flattened out primer, little to no valley around primer. Very flat and level with back of case.
A severe pressure problem would show these signs as well as a firing pin dent being pushed back out, or blown primer pocket (gas leak) or ruptured firing pin dent. (Not to mention case sticking in chamber)
Last edited:
Icefire said:
Left is my reload, CCI primer, 4.4gr Universal Clay, 180gr lead SWC.
Right is Factory CCI Blazer 180gr FMJ.
It's me or there is some pressure sign on the CCI?
Icefire... The case on the right is showing signs of the primer extruding back into the firing pin hole. This can be a sign of higher pressure and if it extruded further it would "blank" ie pierce, and the little piece of primer would blow back into the firing pin hole and high pressure gas would be ejected. A smaller firing pin hole would reduce this. Also a harder primer cup would reduce this as well as lower pressure loads. Your reloads may be lower pressure or using harder primers.
I don't like the look of the Blaser fired primers in your gun.
NormB
Missing Something said:Looks all OK to me...
When you have the entire primer flattened then you may have problems.
just my 2 cents....
Case on the left is normal. Primer fully seated and nicely rounded edges to the primer and a slight valley around the primer.
Case on the right is a slight sign of pressure. Flattened out primer, little to no valley around primer. Very flat and level with back of case.
A severe pressure problem would show these signs as well as a firing pin dent being pushed back out, or blown primer pocket (gas leak) or ruptured firing pin dent. (Not to mention case sticking in chamber)
Is it the photo, or does the case on the left look like the case head is about to separate? (thin, shiny ring part way up the case)
Primers by themselves don't tell you too much really........
The primers in all those pics without any other pressure signs indicates to me that they are normal pressure loads. Brass flow into the ejector/extractor hole coupled with a flattened primer would say slow down though
The primers in all those pics without any other pressure signs indicates to me that they are normal pressure loads. Brass flow into the ejector/extractor hole coupled with a flattened primer would say slow down though
I would really hestitate to take all the pressure signs that we know and love for RIFLES, and start applying them to HANDGUN primers. A.40 S&W is a 33,000 PSI cartridge, a 30-06 is more like 50,000 in mild factory guise.Think about it!
Missing Something
Regular
Dogleg said:
It was just to show what pressure signs look like, granted Rifle cartridges generate higher pressures and show signs better because of that, its easier to show than the lower pressure handgun cartridges. I also didn't have overpressure handgun cases to show.
FWIW - In an semi-auto handgun there is also a bulge that can show where the feed ramp on the barrel is located in an unsupported barrel.
just my 2 cents...
Well the CCI case was fired in a beretta while my reload was in my gun (CZ).
Both are CCI primer so I guess that CCI Blazer ammo is just loaded kinda hot. I know they make around 950-1000fps since they make major.
Might only be a very large firing pin hole in the Beretta 96 the guy was shooting.
Both are CCI primer so I guess that CCI Blazer ammo is just loaded kinda hot. I know they make around 950-1000fps since they make major.
Might only be a very large firing pin hole in the Beretta 96 the guy was shooting.
- Location
- The Conservative part of Ontario
If you want to compare pressures by primer (An inexact science at best) then you will have to use two loads the same primer.
Icefire said:
I'd say that it's a sign of higer pressure...but It wouldn't worry me too much...
If that happend with my re-loads...I'd probably just put in a longer firing pin to help prevent the primer flow...and be done with it...
If I started to see other signs of pressure, namely flattened out primers and breach face marks of the case head...then I'd find a different load...
