Changing Pocket Uniformers On Lyman Prep Center

Hand decappers, chamfer/deburr tool, primer pocket tool.

Changing Pocket Uniformers On Lyman Prep Center

Postby Ranch Dog » 17 May 2018 06

After yesterdays run of brass across the Lyman Prep Center, I decided to ordered new RCBS Large Pistol and Small Uniformers to replace the Lyman toolheads. Some time ago I had bought the RCBS Large Rifle Uniformer as the Lyman tool is not specific as to which primer pocket it is made for. From measurement, it is for a Large Pistol pocket; hence, the need for the Large Rifle.

What I've noticed is that the Lyman Cutters have dulled where the RCBS Large Rifle is still is as sharp as the day I bought it and it has prepped more Large Rifle brass than the Lyman Large Pistol and Small has combined. The problem with the Lyman cutters is that they have a flat surface with no way for the trimmed brass to exit the head after it has been removed. I have found myself with a toothbrush in one hand cleaning the cutter between every case.

The RCBS tools have a slot cut on each side of the head for the debris to exit.

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If you have ever wondered what the dimensions of primer pockets are, here is the SAAMI drawings.

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Hey, the forum has been slow.
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby JohnnyEnfield » 17 May 2018 07

Great info as always. Thank you sir.
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby Ranch Dog » 17 May 2018 14

JohnnyEnfield wrote:Great info as always. Thank you sir.

You're welcome!
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby GasGuzzler » 17 May 2018 21

An obvious thanks.
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby larryw » 19 Jun 2018 14

Question RD, when you use the crimp remover to
bevel the primer pocket mouth, do you give it the
full, all the cutter has bevel, or just touch it &
just break the Edge?
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby Ranch Dog » 22 Jun 2018 06

The full depth.
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Re: Changing Pocket Uniformers On Lyman Prep Center

Postby daboone » 22 Jun 2018 09

I've used the assortments of RCBS, Lyman, Hornady on my RCBS case prep center. But for primer pockets I've been using Sinclair uniformers. They required DYI adapters (a pistol case drilled for 10/32 threaded rod, nuts and friction tape). These little sucker refuse to get dull. :D
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