Rifle Cartridge Primer:
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):
Large Rifle Primers (.210" Diameter):
Rifle Cartridge Primer Reloading:
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 fairly distinct and can vary between individual lots produced. Always keep in mind that between primers there can be a hi-lo pressure difference of approximately 12%, when changing primers on a load always start at the start load and work up again.
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.
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