Large Rifle Magnum (LRM)Primers


Below you find a table with some common calibers / cartridges which use Large Rifle Magnum (LRM) primers. Also find further below some common products in this primer size:

Common Cartridges using this Primer Size



CartridgeBullet DiameterPrimer Size
25-300 Remington Ultra Magnum257LRM
257 Weatherby Magnum257LRM
264 Winchester Magnum264LRM
270 Weatherby Magnum277LRM
270 Win Short Mag (WSM)277LRM
300 Dakota308LRM
300 H&H Magnum308LRM
300 Jarrett308LRM
300 Lapua Magnum308LRM
300 Pegasus308LRM
300 Rem Short Action Ultra Mag308LRM
300 Remington Ultra Magnum308LRM
300 Weatherby Magnum308LRM
300 Win Short Mag (WSM)308LRM
300 Winchester Magnum308LRM
30-338 Lapua Magnum308LRM
30-338 Winchester Magnum308LRM
30-378 Weatherby Magnum308LRM
308 Baer308LRM
308 Norma Magnum308LRM
30-8mm Remington Magnum308LRM
325 Winchester Short Magnum (WSM)323LRM
330 Dakota338LRM
338 Lapua Magnum338LRM
338 Remington Ultra Magnum338LRM
338 Winchester Magnum338LRM
338-300 Win Short Mag (WSM)338LRM
338-300 Winchester Magnum338LRM
338-378 Weatherby Magnum338LRM
338-8mm Remington Magnum338LRM
340 Weatherby Magnum338LRM
350 Remington Magnum358LRM
358 Norma Magnum358LRM
35-8mm Remington Magnum358LRM
375 Dakota375LRM
375 H&H Flanged Magnum375LRM
375 H&H Magnum375LRM
375 Remington Ultra Magnum375LRM
375 Weatherby Magnum375LRM
375-338 Winchester Magnum375LRM
375-350 Remington Magnum375LRM
378 Weatherby Magnum375LRM
416 Dakota416LRM
416 Hoffman416LRM
416 Remington Magnum416LRM
416 Rigby416LRM
416 Taylor416LRM
416 Weatherby Magnum416LRM
416-300 Remington Ultra Magnum416LRM
404 Jeffery422LRM
425 Express423LRM
450 Ackley Magnum458LRM
450 Dakota458LRM
458 Lott458LRM
458 Winchester Magnum458LRM
Large rifle magnum primers are a type of primer used in ammunition reloading for firearms. They are designed for use in cartridges with large rifle calibers, such as .30-06, .300 Winchester Magnum, and .338 Lapua Magnum. The "magnum" in their name indicates that they are designed for use with high-performance loads that require a hotter and more consistent ignition than standard primers can provide.

Like other types of primers, large rifle magnum primers consist of three main components: the cup, the anvil, and the primer compound. The cup is a small metal case that holds the primer compound and provides a surface for the firing pin to strike. The anvil is a small piece of metal that sits inside the cup and helps to ignite the primer compound. The primer compound is a highly sensitive explosive mixture that is designed to ignite quickly and consistently when struck by the firing pin.

The primer compound in large rifle magnum primers is typically composed of a mixture of chemicals that are highly reactive and heat-sensitive. This includes compounds like lead styphnate, which is commonly used in most types of primers, as well as other chemicals like barium nitrate, antimony sulfide, and other proprietary ingredients that are specific to each manufacturer.