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1-d-home.gif - 1035 Bytes Centerfire Rifle Cartridges: Reloading - Equipment - Black Powder - Recoil.
Accuracy: Brass - Primers - Powder - Bullets - Run-Out - Load Testing.
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Accuracy - Brass - Primers - Powder - Bullets - Run-Out - Load Testing

Rifle Cartridge Primer:
 The centerfire rifle cartridge is aptly named because the cartridge ignition source is a primer located in the center of the cartridge casings web. The type of primer used in American manufactured ammuntion is boxer, which have an internal anvil and small explosive charge that when struck by a firing pin ignites, the flame travels through the flash hole in the cartridge case web and enters the case body where the main powder charge is then ignited. The two standard primer sizes for metallic centerfire rifle cartridges are small rifle which are .175" diameter and large rifle which are .210" diameter.
Small Rifle Primers (.175" Diameter):

Small Rifle: Is used for most rifle cartridges requiring a small rifle primer.
Small Rifle Magnum: Is generally used for heavy loads and ball propellants.

Large Rifle Primers (.210" Diameter):
Large Rifle: Is used for most rifle cartridges requiring a large rifle primer.
Large Rifle Magnum: Is generally used for large case capacity rifle cartridges,
or when using ball propellants.

Primer Manufacturers & Identification Charts


Accuracy Reloading, Primers:
Written by: Kim Lockhart, Copyright.

Rifle Cartridge Primers:
 Primers directly affect accuracy more than most people or reloaders realize. The primer is the only component in a cartridge that sets off a chain reaction of events. The first thing that the primer does is start the bullet moving out of the cartridge case and at the same time it ignites the powder charge which in turn pushes the bullet out of the barrel.

 Some of the things that can dictate a certain primer usage are extremely hard or soft bullets, bullet seating depth, powder selection by burn rate and or amounts of powder used in the case.

 Rifle primers are not the same by any means, there is a difference in the length of time which primers burn. Primers can be selected by heat or pressure range of which there are three.

 Always keep in mind that between class a and class c primers there can be a hi-lo pressure difference of approximately 12%, if working at the high end of a cartridges pressure if you change primers change the powder charge as well.

.210" Diameter Large Rifle Primers:
Class A Large Rifle: Federal 210, Remington 9-1/2 primers will generate about 6% less pressure than class b primers and are well suited for faster igniting rifle powders like IMR 3031.
Class B Large Rifle: CCI 200 primers are well suited for medium range burning rifle powders like IMR 4320.
Class C Large Rifle Magnum: CCI 250, Federal 215, Remington 9-1/2M primers will generate about 6% more pressure than class b primers and are well suited for slower burning rifle powders like IMR 4350, 4831, 7828.

 Note: Small rifle primers do not have a great a heat range variance as do large rifle primers but there are still three different pressure levels or heat ranges.

.175" Diameter Small Rifle Primers:
Class A Small Rifle: Remington 6 1/2.
Class B Small Rifle: CCI 400.
Class C Small Rifle: Federal 205.

 Just remember when it comes to custom handloading of rifle cartridges there is nothing cast in stone, it is all a matter of trial and error for each individual rifle.


Accuracy - Brass - Primers - Powder - Bullets - Run-Out - Load Testing
223 Remington
243 Winchester
25-06 Remington
270 Winchester
7mm Rem. Mag.
30-30 Winchester
308 Winchester
30-06 Springfield
300 Win. Mag.
Reloading Directory:
Primers & Charts


Rifle Cartridges And Reloading - Rifle Cartridges And Ballistics