Felt this on my face….

[orkan]

56.7 is on the top end, no question. I'd switch to Fed215/215M or CCI250 if you're going to run that heavy a charge. Some primers can't take that kind of pressure.

In all of my testing with 140's, I hit heavy bolt lift right at 57gr of H4831SC at a velocity around 3050fps. So you're pushing it. I'd back that off for certain.


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[del2les]

Most likely, a bad primer wall. Through the decades, I and friends have seen a few of these on various loads and cartridges, and if memory serves, they were always related to a weak primer that pin holed. Depending on year/s and lot of mfg, some brands are more prone to this.

 

[RUFFIAN R - NY]

glad you are ok- never seen anything like that !!

 

[DocGlenn]

glad you are ok- never seen anything like that !!

First for me as well. I'm really glad I had my glasses on. Not sure if the powder residue would have made to my eye, but it would have been very close.

 

[Skimbleshanks]

Thats happened to me with a real hot load before. I found new data and the problem went away.

 

[Roughrice]

Yup... Weak spot on primer wall... probably a manufacturing glitch.
But... I agree with other opinions...you are running too hot.

 

[Sbrinkley]

Thanks for the info guys. It does seem like I'm running hot. Going to back off and try again. Really appreciate the feedback.

I am currently running 54gr of the 4831SC and Federal 210M primers with ADG brass at 2,960fps and no issues.

 

[cohunt]

Was it a win primer? They had some bad primers a few years ago-- if you pop the primer out and see if it's a pin hole in the primer or between primer and pocket wall.

Probably too hot too.

 

[Muddyboots]

Hodgdon doesn't show a 140 grain load with H4831SC, its H1000, US 869 or Retumbo. Berger doesn't show 6.5PRC load data at all so nothing on their website with the 140 with H4831SC either. I attached load data from Hornady that shows 143ELDX max load with IMR4831 at 52.7 gr which is slightly faster than H4831SC. I would contact Berger to validate your load data since dropping one grain may still not be where you need to be with H4831SC and this bullet. Good luck!

 

[quigley257]

My first guess is Winchester primer. I have seen this time and again with their large rifle primers over the years.

 

[Briant_az]

Hodgdon doesn't show a 140 grain load with H4831SC, its H1000, US 869 or Retumbo. Berger doesn't show 6.5PRC load data at all so nothing on their website with the 140 with H4831SC either. I attached load data from Hornady that shows 143ELDX max load with IMR4831 at 52.7 gr which is slightly faster than H4831SC. I would contact Berger to validate your load data since dropping one grain may still not be where you need to be with H4831SC and this bullet. Good luck!

Here is the data that I got from Berger a couple months ago...

 

[DocGlenn]

Here is the data that I got from Berger a couple months ago...View attachment 365145

So I was 1.9gr over max. That's not what I usually do. Not sure where I messed up. Great info in that chart. Thanks!

 

[North Idaho Hunter]

If you have your lot # handy off those Winchester primers give them a call - a few years ago this happened to us as well.

 

[Taylorbok]

So I was 1.9gr over max. That's not what I usually do. Not sure where I messed up. Great info in that chart. Thanks!

I'm not sure what you are looking at but that chart shows a max charge of 58gr with 4831sc