Large Rifle Magnum (LRM) Primers

Primers are a key ammunition reloading component. They are needed to ignite the powder charge. There a seven primer sizes which differ by use (pistol vs. rifle ammunition), size (small vs. large) and force (normal vs. magnum): SP = Small Pistol Primers | SPM = Small Pistol Magnum Primers | LP = Large Pistol Primers | LPM = Large Pistol Magnum Primers | SR = Small Rifle Primers | LR = Large Rifle Primers | LRM = Large Rifle Magnum Primers.

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

RWS 5333 Large Rifle Magnum (LRM) Primers

A large number of Olympic victories prove the excellent quality of RWS ammunition, which many well-known and competent top shooters rely on. In addition, rifle cartridges and components from RWS stand for the highest quality standard and first-class precision.RWS primers are subject to demanding quality tests. The igniter is produced on a state-of-the-art production facility that was installed a few years ago. Production is carried out in the order of punching, drawing the cup, inserting the primer, drying and pressing, and pressing in the anvil, accompanied by integrated, automatic quality checks. The RWS 5333 Large Rifle Magnum (LRM) Primers have specifically been developed for large rifle magnum cartridges. Find all Large Rifle Magnum (LRM) Primers by following the Link.The most important features at a glance:Sinoxide primersAvailable for almost all igniter typesManufactured to the highest quality levelCan be used in all standard reloading toolsPerfect burning behavior even with large-volume casesCommon Cartridges suitable for 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

Common Cartridges using this Primer Size

Cartridge	Bullet Diameter	Primer Size
357 Automag	357	LP
38-45 ACP	357	LP
10mm Auto	401	LP
38-40 WCF	401	LP
400 Cor-Bon	401	LP
41 Remington Magnum	410	LP
44 Russian	429	LP
44 Remington Magnum	430	LP
44 Special	430	LP
445 Super Magnum	430	LP
45 ACP	451	LP
45 Auto Rim	451	LP
45 GAP	451	LP
45 Winchester Magnum	451	LP
45 Colt (Long Colt)	452	LP
45 S&W Schofield	454	LP
455 Webley	454	LP
219 Donaldson Wasp	224	LR
219 Zipper	224	LR
22 BR (Bench Rest)	224	LR
22 CHeetah	224	LR
220 Jaybird	224	LR
220 Swift	224	LR
220 Weatherby Rocket	224	LR
220 Wilson Arrow	224	LR
22-250 Remington	224	LR
223 Win Short Mag	224	LR
223 Win Super Short Mag (WSSM)	224	LR
224 Clark	224	LR
224 Weatherby Magnum	224	LR
225 Winchester	224	LR
240 Gibbs	243	LR
240 Page Souper Pooper	243	LR
240 Weatherby Magnum	243	LR
243 Catbird	243	LR
243 Win Short Mag	243	LR
243 Win Super Short Mag (WSSM)	243	LR
243 Winchester	243	LR
25 Gibbs	257	LR
25 Remington	257	LR
25 Souper (25-308 Winchester)	257	LR
25 Win Super Short Mag (WSSM)	257	LR
250 Savage	257	LR
25-06 Remington	257	LR
25-20 WCF	257	LR
25-284 Winchester	257	LR
25-300 Win Short Mag (WSM)	257	LR
25-35 WCF	257	LR
25-36 Marlin	257	LR
257 Roberts	257	LR
257 STW	257	LR
260 Remington	264	LR
270 Gibbs	277	LR
270 Winchester	277	LR
270-284 Winchester	277	LR
270-308 Winchester	277	LR
276 Pedersen	284	LR
280 Remington and 7mm Express	284	LR
284 Winchester	284	LR
30 Gibbs	308	LR
30 Herrett	308	LR
30 Remington	308	LR
300 Savage	308	LR
30-06 Springfield	308	LR
30-284 Winchester	308	LR
303 Savage	308	LR
30-30 Winchester	308	LR
30-40 Krag	308	LR
307 Winchester	308	LR
308 Winchester	308	LR
308x1.5”	308	LR
308x1.75”	308	LR
303 British	312	LR
32 Remington	320	LR
32-40 WCF	320	LR
32 Winchester Special	321	LR
33 WCF	338	LR
338 Marlin Express	338	LR
338-06 A-Square	338	LR
338-284 Winchester	338	LR
348 Winchester	348	LR
356 Winchester	357	LR
357 Herrett	357	LR
35 Remington	358	LR
35 Whelen	358	LR
35 Winchester	358	LR
35-284 Winchester	358	LR
358 Winchester	358	LR
375 Ruger	375	LR
375 Whelen	375	LR
375 Winchester	375	LR
375-284 Winchester	375	LR
376 Steyr	375	LR
38-55 WCF	376	LR
38-72 WCF	378	LR
40-50 Sharps Bottle Neck	403	LR
40-50 Sharps Straight	403	LR
40-70 Sharps Bottle Neck	403	LR
40-70 Sharps Straight	403	LR
40-90 Sharps Bottle Neck	403	LR
40-90 Sharps Straight	403	LR
40-60 WCF	404	LR
450-400 Nitro Express 3”	405	LR
401 Winchester Self-Loading	406	LR
40-65 WCF	406	LR
40-82 WCF	406	LR
405 Winchester	411	LR
10.3x60mm Rimmed Swiss	415	LR
44-40 WCF	427	LR
444 Marlin	429	LR
425 Westley Richards	435	LR
43 Spanish	439	LR
11x59mm Rimmed French Gras 43 Mauser	445	LR
45-100 Sharps Straight	451	LR
45-110 Sharps Straight	451	LR
45-120 Sharps Straight	451	LR
45-60 WCF	454	LR
45-75 WCF	454	LR
45-90 WCF (45-85 WCF)	457	LR
450 Marlin	458	LR
450 Nitro Express	458	LR
450 Number 2 Nitro Express 3-1/2”	458	LR
45-70 Government	458	LR
458x2” American	458	LR
25-300 Remington Ultra Magnum	257	LRM
257 Weatherby Magnum	257	LRM
264 Winchester Magnum	264	LRM
270 Weatherby Magnum	277	LRM
270 Win Short Mag (WSM)	277	LRM
300 Dakota	308	LRM
300 H&H Magnum	308	LRM
300 Jarrett	308	LRM
300 Lapua Magnum	308	LRM
300 Pegasus	308	LRM
300 Rem Short Action Ultra Mag	308	LRM
300 Remington Ultra Magnum	308	LRM
300 Weatherby Magnum	308	LRM
300 Win Short Mag (WSM)	308	LRM
300 Winchester Magnum	308	LRM
30-338 Lapua Magnum	308	LRM
30-338 Winchester Magnum	308	LRM
30-378 Weatherby Magnum	308	LRM
308 Baer	308	LRM
308 Norma Magnum	308	LRM
30-8mm Remington Magnum	308	LRM
325 Winchester Short Magnum (WSM)	323	LRM
330 Dakota	338	LRM
338 Lapua Magnum	338	LRM
338 Remington Ultra Magnum	338	LRM
338 Winchester Magnum	338	LRM
338-300 Win Short Mag (WSM)	338	LRM
338-300 Winchester Magnum	338	LRM
338-378 Weatherby Magnum	338	LRM
338-8mm Remington Magnum	338	LRM
340 Weatherby Magnum	338	LRM
350 Remington Magnum	358	LRM
358 Norma Magnum	358	LRM
35-8mm Remington Magnum	358	LRM
375 Dakota	375	LRM
375 H&H Flanged Magnum	375	LRM
375 H&H Magnum	375	LRM
375 Remington Ultra Magnum	375	LRM
375 Weatherby Magnum	375	LRM
375-338 Winchester Magnum	375	LRM
375-350 Remington Magnum	375	LRM
378 Weatherby Magnum	375	LRM
416 Dakota	416	LRM
416 Hoffman	416	LRM
416 Remington Magnum	416	LRM
416 Rigby	416	LRM
416 Taylor	416	LRM
416 Weatherby Magnum	416	LRM
416-300 Remington Ultra Magnum	416	LRM
404 Jeffery	422	LRM
425 Express	423	LRM
450 Ackley Magnum	458	LRM
450 Dakota	458	LRM
458 Lott	458	LRM
458 Winchester Magnum	458	LRM
22 Cooper Centerfire Mag (CCM)	221	SP
22 Remington Jet	223	SP
25 ACP	251	SP
256 Winchester Magnum	257	SP
30 Luger	308	SP
30 Mauser	308	SP
32 ACP	309	SP
32 H&R Magnum	312	SP
32 S&W Long	312	SP
32 S&W Short	312	SP
32 Short Colt	313	SP
38 Super	355	SP
380 ACP	355	SP
357 Sig	356	SP
38 Long Colt	357	SP
38 Special	357	SP
38 S&W	359	SP
41 Long Colt	386	SP
40 S&W	401	SP
40 Super	401	SP
357 Magnum	357	SPM
357 Maximum	357	SPM
17 Hornet	172	SR
17 Javelina	172	SR
17 Mach 4	172	SR
17 Remington	172	SR
20 Tactical	204	SR
204 Ruger	204	SR
218 Bee	224	SR
22 Hornet	224	SR
22 PPC	224	SR
220 Russian	224	SR
221 Fireball	224	SR
222 Remington	224	SR
222 Remington Magnum	224	SR
223 Remington	224	SR
25 TCU	257	SR
25-20 Single Shot	257	SR
25-222 Remington Magnum	257	SR
28-30 Stevens	285	SR
30 BR (Bench Rest)	308	SR
30 Carbine	308	SR
30-223 Remington	308	SR
32-20 WCF	312	SR
310 Cadet	316	SR
351 Winchester Self-Loading	351	SR
454 Casull	452	SR

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.