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Yet another PPU Question...

wIg SpLiTtEr

Private
Full Member
Minuteman
Feb 20, 2012
22
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36
Texas
Where does the benefit of primer pocket uniforming come from? Does it lie in fact that the pocket is left with a perfectly square/flat base, the depth, or a combination of both? Reason I ask is because I'm having a hell of a time getting them to cut exactly the same depth. I'm using the RCBS PPU and it seems to be gradually getting deeper with the high volume of pistol brass Im doing. Things I already know: I need to get a Sinclair PPU and I'm wasting my time. Feel free to chime in with advise and real world experience.

Thanks,
S2K
 
Re: Yet another PPU Question...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: M855</div><div class="ubbcode-body">your doing that with pistol brass? unless your shooting f class or some other long range comp your pissing in the wind </div></div>Hi M855,

Perhaps you don't realize that your comment is insulting. Probably to S2K but definitely to me. When someone asks a question or for help, negative reference to bodily functions shows that you have no interest in helping and would prefer to diminish the importance of the asker.

S2K asked why it helps.

I've been studying reloading off and on since the 70's but only been doing it for around 3000 rounds (I go by primers purchased and consumed) so I am a newbie.

That said, it is my understanding that:
Accuracy is related to consistency.
A part of consistency making every component the same.
Primer pockets are not consistent when they come out of the punch presses.
By PPU, you are making them as consistent as you can.
Same depth, yes.
All flat bottom, yes.
Flash hole same diameter, yes.
Deburr/champher flash hole, yes.

The primer pockets for all the pieces of brass are 'uniform'.

Result, the flash from the primer enters the powder the same way for every cartridge.

That's how I understand it.