Originally Posted by dmax1800
The primers are a tight fit in the new brass. The case head is apparently bulging, not the primer. The primer doesn't stick past the end of the case head. On some cases when I seat the bullet, the case head to ogive is longer than on a case with no primer.
I don't think I could get a picture of a primer that is .001 or .002 above the case head. I also don't think I could get a picture of a small bulge resulting in .005 longer case length.
I am using the green tray with an RCBS shell holder.
The pocket uniformer is clean. I clean it every time I use it.
A bad sloppy shell holder is a thought. I have another one I'll try. Thanks.
I cannot see how the case head can 'bulge' from seating a primer, it's not possible as far as I am aware. I believe the primer is high and giving you a false reading.
All primers are designed to not only bottom out in the primer pocket, but also to push the anvil into the cup until it is also flush with the bottom of the cup, this gives the priming mix a slight pre ignition squish and sets up the primer to take the full hit from the firing pin, if it isn't flush, some of the firing pin energy is absorbed by the primer being seated further into the cup, it is necessary for the primer to be seated .003"-.005" below flush for the above factors to be present.
Some primer and case combo's are just harder to seat, if the primer is still high you will have to reseat it until it is below flush.
I have this problem with Norma cases and Federal primers, but Winchester primers don't seat as hard and bottom out without having to use excessive force.