Primer pocket

[BenPerfected]

I have a few 4-5 X fired cases where the primer does not completely seat. It shows up + .002.-.005 on the calipers when checking seating depth. What likely caused this? I put a primer pocket cleaning tool in a hand drill and slightly counter sunk the pocket so the primer seats 100%. Normal?
Ben

 

[rocketron]

is the decaping pin set to low and hitting the inside of the case head?

 

[357Mag]

BenP -

Howdy !

To be clear.... did you use a primer pocket " cleaning " tool, or.... a " primer pocket reamer " ?

Sometimes you'll need to cut primer pockets to full depth yourself, after their manufacture.


With regards,
357Mag

 

[amlevin]

is the decaping pin set to low and hitting the inside of the case head?

Not as big a problem as some might suggest. Primers seat around their perimeter and primer decapping rods distort the center.


I use a Sinclair Primer Pocket uniforming tool for both uniforming primer pockets AND cleaning them. First time around they actually cut metal and from there out they merely scrape the crud. My primers never fail to seat properly.

 

[Sheldon N]

I use a Sinclair Primer Pocket uniforming tool for both uniforming primer pockets AND cleaning them. First time around they actually cut metal and from there out they merely scrape the crud. My primers never fail to seat properly.

I do the same, in a drill it's quick and easy.

 

[Patch700]

The OP is saying his primers are .002-.005" proud of the pocket... This means they are worse case scenario .010" from where they are supposed to be. That is a lot of pocket to cut , especially for a case that was at one point deemed acceptable..(assuming these were at one point fine)

I would venture to guess that rocketron is into sonething with regards to a problem during depriming.

 

[BigBlueandGoldie]

I use a Sinclair Primer Pocket uniforming tool for both uniforming primer pockets AND cleaning them. First time around they actually cut metal and from there out they merely scrape the crud. My primers never fail to seat properly.

I do the same, in a drill it's quick and easy.

X3, it's quick and easy.

 

[TimP]

I use a whitetail primer pocket tool to uniform then clean my primer pockets. With some brass it will remove small amounts of brass for three or four cleanings while other brass nothing but primer residue after the initial uniforming. As others have said check to make sure your die stem isn't hitting the case head when you are depriming your cases. I cant see that much brass flowing back without an excessive load.

 

[BenPerfected]

is the decaping pin set to low and hitting the inside of the case head?

I think this is likely the cause, haven't done this often but know there have been times when the recapping pin/rod has been set too low.
Ben

 

[K22]

I also use the Sinclair Uniforming tool which does a great job.

I'm not sure if it improves accuracy or not but if you compare a primer pocket that has been uniformed to one that hasn't you will see the visual evidence of how even the ignition is with the uniformed pocket. I was truly amazed.

I also use the uniformer to remove the fouling and this also does a perfect job of it.