This is the first time i have seen this out of any of my reloads ever. I done see any other signs of possable over pressure and i am sort of unsure if this is a sign. Can someone please tell me if this is an over pressure sign. The only thing i am seeing is the ridging around where the firing pin is hitting the primer. All of the loads i have ever done have always stayed in the middle range of the suggested load range. These were shot with varget 22.5gr-25.5gr at .3 gr incraments behind a sierra 69gr bullet. Any thoughts or help would be appreciated. Thanks
Over pressure
- Thread starter Raven243
- Start date
I bet it's a Remington! 
It's been covered many times on here and elsewhere. Try searching for cratered primers on here.
I agree, it doesn't look like pressure. The primer edges are still quite rounded.--Mike
It's been covered many times on here and elsewhere. Try searching for cratered primers on here.
I agree, it doesn't look like pressure. The primer edges are still quite rounded.--Mike
Quickload tells me your max load should be around 24.6.0gr @ 2.260" COAL (assuming a case volume of 29.9 gr H2O). Here's a post on case capacity:
https://www.ar15.com/archive/topic.html?b=6&f=42&t=318330
I agree with gunsandgunsmithing, the primers should look flat if they're cratered from pressure. What kind of primers are you using?
https://www.ar15.com/archive/topic.html?b=6&f=42&t=318330
I agree with gunsandgunsmithing, the primers should look flat if they're cratered from pressure. What kind of primers are you using?
bigedp51
Your primers are flowing into the bevel in the firing pin hole, so it not over pressure, it is caused by "modern cost saving machining methods". (your cup runneth over)
Ledd Slinger
Silver $$ Contributor
bigedp51 said:Your primers are flowing into the bevel in the firing pin hole, so it not over pressure, it is caused by "modern cost saving machining methods".
Been readin and wondering about it myself. Great pic. That makes sense
bigedp51
If you think a Remington 700 has problems then get a over gassed AR15 that still has pressure in the barrel when the bolt starts moving to the rear.
These cases had the shoulder bumped back too far creating too much head clearance, this punched the hole in the primer and the anvil plugged the leak.
The person who posted the photo also asked if he had a over pressure problem.
These cases had the shoulder bumped back too far creating too much head clearance, this punched the hole in the primer and the anvil plugged the leak.
The person who posted the photo also asked if he had a over pressure problem.
Shynloco
You can lead a horse to water, but ........
The title pretty much says it all. Are those shot in an AR or bolt gun? Personally, I've never been a fan of using Varget in an AR simply because of the quick pressure rise using Varget in an AR. IMHO, using 69 gr bullets being pushed by 25 gr is on the heavy side of a load with Varget. Might want to either back off or switch to a more forgiving powder as that cratering is pretty pronounced. Another possibility is that using a heavy load and jamming the bullet creates a double wammie as far as "pressure" goes. If thats the case, back off on the jam and see what happens. Just my take as I've never had much success using Varget in my son's AR. And if it's a bolt gun, same story but I use BLC2 which out-shoots Varget in his rifle.
Alex
Alex
Heman said:
If the primers are not "blanking" or being pierced is there really a problem?
With the Remington I haven't replaced the bolt on (yet) I get this false cratering all the time. I just don't pay any attention to it, focusing on the edges of the primer instead. After many thousands of rounds I have yet to have any primers "blank" or pierce so again, is it really anything other than a cosmetic issue.
FWIW, I've read numerous times that Remington chamfers this edge on purpose to prevent blanking (where a piece of the primer metal is cut by the sharp edges and then fills the firing pin channel).
CatShooter
amlevin said:
"FWIW, I've read numerous times that Remington chamfers this edge on purpose to prevent blanking (where a piece of the primer metal is cut by the sharp edges and then fills the firing pin channel)."
I have not heard that, but I think it is interesting - in the beginning of this primer hole thing (maybe 10 or 15?? years ago)... it was just lax standards and poor inspection - but I can see that the bevel would act like dull scissors and not allow the edge to cut the primer metal.
I used to worry about it, but not anymore. I did send a Rem bolt to be bushed and found little improvement, so now I just live with it.
I see that as poor engineering. Brass is going to flow to where it is unsupported, IMO...whether that be a chamfer or simply space around the pin. Clearly, a chamfer leaves lots of room. Granted, it may help prevent blanking but doesn't correct the underlying and real issue..being poor fit between the pin and the fp hole. In fact, Savage has a slight concave around the pin in their bolt heads. Simply truing the face, leaving a sharp edge around the pin hole, I've found to reduce, not increase, brass flow on them...but their pin fit seems better than Remington's. The chamfer seems like a band-aid rather than a cure.CatShooter said:
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