primer pocket uniformer question.......... (6mm ppc)

S

scott mims

Guest
a couple of years ago i bought a primer pocket uniformer case specific (6mm ppc) for my brass. i have always noticed that the brass does not "bottom out" on the uniformer. (hope that made since). doing it by hand would wear you out I'm sure if you tried and would take forever. anyway....... i put the uniformer in a cordless screwdriver the other day and it is/ almost bottoming out now.but what I'm scared of, am i cutting to much out of the primer pocket or should i trust the case specific uniformer is cutting what it suppose to?

by the way it is not a adjustable one. for over 10 years i just used a small primer pocket uniformer but wanted to get a 6mm ppc uniformer........ i guess......... just because. :roll eyes:

let me know what you think and for consistency shouldn't they ALL bottom out and not worry about it? after you shoot your brass 5 to 10 times each does all that pressure cause the primer pocket to get deeper or less deep? i have noticed over the years that the pockets don't hold the primers like they did when they were new, but i never paid attention to the depth part of it

sorry if none of that made any sense :)
 
scott mims said:
a couple of years ago i bought a primer pocket uniformer case specific (6mm ppc) for my brass. i have always noticed that the brass does not "bottom out" on the uniformer. (hope that made since). doing it by hand would wear you out I'm sure if you tried and would take forever. anyway....... i put the uniformer in a cordless screwdriver the other day and it is/ almost bottoming out now.but what I'm scared of, am i cutting to much out of the primer pocket or should i trust the case specific uniformer is cutting what it suppose to?

by the way it is not a adjustable one. for over 10 years i just used a small primer pocket uniformer but wanted to get a 6mm ppc uniformer........ i guess......... just because. :roll eyes:

let me know what you think and for consistency shouldn't they ALL bottom out and not worry about it? after you shoot your brass 5 to 10 times each does all that pressure cause the primer pocket to get deeper or less deep? i have noticed over the years that the pockets don't hold the primers like they did when they were new, but i never paid attention to the depth part of it

sorry if none of that made any sense :)
Click to expand...

Scott, Make sure your decapper pin nut is not bottoming out in the bottom of the case when you resize, if it is, it will push the brass into the primer pocket and shorten the depth. Will cause exactly what your asking about. It will feel just like your bumping the shoulder back.
All the best!
Charlie
 
Last edited:
thanks Charlie. i just want to make sure I'm not cutting to much. BUT.... if i don't "bottom" the uniformer out then I'm sure I'm cutting different depths in the primer pocket. MAYBE its not enough to tell on the target but if we get anal with everything else why not doing this. i just never thought about it. all i ever wanted to do is make sure i got most of the crap out of the primer pocket when i got the primer out...... never really thought about making sure everything was squared up............ see.... I'm going to start winning every match i go to now. :):):):):):):):)

and by the way hope all the Hoods are doing good. hope to see y'all at riverbend in september
 
Last edited:
those measurements i would guess are before any uniforming is done. the max for a small rifle is 0.123" so if you uniform one would it be ok if after you uniform it and it measures lets say 0.124" - 0.125" is that ok? as long as they measure the same i would guess thats good BUT how deep is to deep? are am i missing something are they saying 0.123" is the most it should ever be?
 
Last edited:
Maximum pocket depth is .123" for standard cartridges. After the primer is seated, it should be about .004" below the case head. But primers being of different dimensions, it could be sitting flush with the case head or .010" below. You want primers fully seated to avoid misfires.
 
Last edited:
if I'm measuring right the primer pocket uniformer i have cuts 0.125" is that to much? i will not put any company names in these post but it is marked "ppc" on the uniformer.
 
Personally, I think that the whole primer pocket uniforming thing is vastly overrated. My uniformers are set to barely scrape the bottom of new brass, and all that I use them for is to clean the pockets. When I do, the amount of residue that is left looks very uniform from case to case, which tells me that the pockets are pretty uniform. I seat primers by feel, and they are not all the same thickness to start with.
 
i guess what got me worried about this is the gap i was talking about between the brass and the uniformer. to me it seems like they would be made so it bottomed out on the uniformer so you know you are uniforming them all the same. but mine has the gap. now that being said it was driving me crazy so i got out about 75-100 pieces i already had neck turned and put the uniformer in a electric drill and PRESSED them on the uniformer so i know they are bottoming out/almost bottoming out. but when i got through i started thinking did i take to much out and is that unsafe. either way I'm screwing with my mind and will have it in the back of my mind to worry about something else :rolleyes::rolleyes::roll eyes:
 
In a perfect world, i would like the primer flush with the case head when fully seated. Works best when running at high pressures.
 
Check SAAMI standards. An acceptable primer can be several thousandths deeper/thicker than the minimum pocket depth spec.
 
The one I use definitely cuts in and removes brass on some pieces other pieces it just scrapes a little.
After the first time they all seem to act the same and just cleanup
 
since i have been thinking about all of this nonsense :D it got me thinking. i use to hear people weighing each primer. but as far as getting them all seated the same have you ever heard of anyone measuring them to group them together (depth wise).

i got out about 20 small rifle primers to measure them majority in that lot was around 0.1205 with a few around 0.1185. i would imagine with seating them to bottom out and if you are good at being repetitive you would take out that difference
 
If you're gonna cut your primer pockets at all, then do a good job! Benchrest shooters need a little something like that to do while they wait on a good barrel.
 
Scott
You are probably talking about Lapua brass. The primer pockets are deeper in Lapua brass. Back when Dick Wright made the White Tail tools he made a regular tool, and a Lapua tool. I have both, the regular tool will not quite clean up Lapua brass.
Dick
 
Carefully measure your primer pocket depths. Then very carefully measure your primer heights. Primers should seat between about 0.002" and 0.005" deeper than the case base for optimum ignition and optimum ignition is what we all want. But, most erratic ignition is caused by firing pin springs that do not do their job consistently.

Worry more as to why all the flag tails don't point the same direction at the same time and why they don't stay together.

Seriously, learn to feel the primer seating. If you feel a slight crush at the end, do that to all of them. If you do not feel hat "crush" use that seating feel to seat them all the same. Bart recently ran some primer seating feel tests and found some interesting results.

.
 
Last edited:
You must log in or register to reply here.
Back
Top