Primer seating depth

[texastonk]

I bought a new Lyman pocket uniformer today. The directions say its a pre set depth
Do not attempt to adjust. So I worked up a few rounds and started setting primers. I noticed the primers are set deeper than normal. They seated with the normal pressure and did not flatten out. Here's a few pics.

 

[former naval person]

Re: Primer seating depth

It all depends on the primer height and the case primer cup depth...some will appear deeper than others. Ideally you should seat them until the cup touches the bottom of the pocket with the anvil giving the primer compound the ideal amount of pre-crush. Most reloaders seat until they feel the primer bottom out. The Dillon progressive (mine at any rate) seats the primer about .001 to .002 below the head of the case. You'll just have to shoot and see. If the compound is crushed by over seating, you may experience mis/hang fires. The same if seated too shallow. I seat until it feels good using my other seaters. I accept the Dillon adjustment. I really cannot tell the difference. If not at least flush, you run the risk of the bolt being hard to close. Or maybe a misfire.

 

[texastonk]

Re: Primer seating depth

My concern is the pocket uniform tool allowed me to cut to deep in the pocket.
The primer is a cci 200. I have used these before with no issue. They seem to set the same depth as the federal 210.

 

[Temp9]

Re: Primer seating depth

Normal. My primers after uniforming with the RCBS tool measure .006" beneath the case head.

 

[DocB]

Re: Primer seating depth

teal28,

I quit using the Dillon primer seater on uniformed pockets after figuring out it wasn't going to properly seat the primers, and went to using a hand primer for everything. Takes extra time, but worth it. The K&M uniformer seats primers about as deep as your picture.

HTH,
DocB

 

[Mr_Brass]

Re: Primer seating depth

Sammi depth is upto .008 I normally shoot for .004-.006 on rifle and .002-.004 on pistol

 

[lunchboxtheman]

Re: Primer seating depth

I recently purchased a Redding primer pocket uniformer and used it on my once-fired mil brass.

After priming with CCI #34 primers for my M1A, the primers are sitting 0.012" to 0.015" below the case head.

I haven't had a chance to see if they fire yet - but even if they do, is this too deep? Will there be any negative side effects of seating them this deep?

Thanks!

 

[BuzzBoss915]

Re: Primer seating depth

I think common practice is to seat to the bottom of the pocket and that's the definition of "primer pocket uniformer". You are looking to seat all primers to the same depth without crushing. The tool alters nothing but the depth and usually takes the radius out of the bottom in accomplishing this. A little below flush is desirable, based on the design of the tool. I would think they are all pretty standard but a guy only need one uniformer so I have not had the opportunity to measure a bunch of different ones.

It looks like you are using nickel brass? Nickel brass is (my opinion) not meant to be worked. It should be loaded as is because the plating is too hard for the trimmers and cutters normally used in turning and uniforming and primer pocket deburring. If I'm wrong, excuse me, but I wouldn't use nickel brass in any application where I might have to do any alteration, like trimming to length, etc.
BB