Primer and Primer Pocket ?

WhiteOak

Well-Known Member
Joined
Oct 10, 2014
Messages
107
How deep does a primer pocket need to be for a WLR primer that is .128" to the anvil ?
 

barefooter56

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Joined
Nov 10, 2014
Messages
913
How deep does a primer pocket need to be for a WLR primer that is .128" to the anvil ?
WhiteOak,
SAMMI spec for Large rifle primer pockets are .125 to .132 and you want the primer to be below flush .003-.005 so .131 or so. Get a good primer pocket uniformer to prep the primer pocket each time you load the cartridge case ( new to discard) that will remove material ONLY from the bottom of the primer pocket. Most are preset to the maximum dimension + or - .001- .0015 or so. Sinclair sells a carbide version along with an adaptor so you can use it with an electric screwdriver that works very well. Be sure to use a good Priming tool that will let you "feel" the anvil just touch the bottom of the primer pocket so you dont crush the primer and affect ignition.
 

Mikecr

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Joined
Aug 10, 2003
Messages
5,596
Location
NC, oceanfront
Actually, primers are supposed to be seated with 2-3thou of crush (preload), but most people don't measure it.
With that & knowing .128 primer height, you'd be seated ~.125 off the pocket, and any amount of casehead above this is sufficient.
 

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