{"id":58609,"date":"2016-05-08T16:22:58","date_gmt":"2016-05-08T20:22:58","guid":{"rendered":"https:\/\/www.gunsamerica.com\/blog\/?p=58609"},"modified":"2016-05-08T16:22:58","modified_gmt":"2023-08-19T18:57:25","slug":"reloading-primers","status":"publish","type":"post","link":"https:\/\/gunsamerica.com\/digest\/reloading-primers\/","title":{"rendered":"Reloading: All About Primers"},"content":{"rendered":"
\"Choosing<\/a>

Choosing the right primer for the job is a bigger deal than you might expect.<\/p><\/div>\n

SERIES<\/span><\/strong><\/h2>\n

Part 1:<\/span><\/strong>\u00a0<\/span><\/b><\/span>Want to Reload Your Own Ammo? Basic Questions to Consider<\/span><\/a><\/span><\/strong><\/p>\n

Part 2:<\/span><\/strong>\u00a0<\/span><\/b><\/span>The Reloading Process<\/span><\/a><\/span><\/strong>
Part 3:<\/span><\/strong>\u00a0<\/b><\/span>The Gear You\u2019ll Need and What It\u2019ll Cost You<\/span><\/a><\/span><\/strong><\/span><\/p>\n

Part 4:\u00a0Brass Cleaning and Preparation to Load<\/span><\/a><\/span><\/strong><\/p>\n

Part 5:<\/span><\/strong>\u00a0<\/span><\/b><\/span>Brass Resizing<\/span><\/a><\/span><\/strong><\/p>\n

Part 6:\u00a0Trimming Cartridge Cases<\/span><\/a><\/span><\/strong><\/p>\n

Part 7:\u00a0Repriming the Cartridge Case<\/span><\/a><\/span><\/strong><\/p>\n

Part 8:\u00a0Powder, Propellants, and Pressure<\/span><\/a><\/span><\/strong><\/p>\n

Part 9:<\/span><\/strong>\u00a0<\/span><\/b><\/span>All About Primers<\/span><\/a><\/span><\/strong><\/p>\n

Part 10:<\/span><\/strong>\u00a0<\/span><\/b><\/span>Projectiles: Materials, Weights, and Styles<\/span><\/a><\/span><\/strong><\/p>\n

Part 11:\u00a0<\/span><\/span>Seating and Crimping Bullets<\/span><\/a><\/span><\/strong><\/p>\n

We don\u2019t give primers a lot of attention, but they have the most important job in the cartridge \u201cgo bang\u201d process. It\u2019s the primer that converts mechanical energy into a small conflagration that ignites the powder charge in the cartridge.<\/p>\n

A primer contains a primary explosive, which basically means that it\u2019s unstable and volatile. Propellants are generally considered secondary explosives. They\u2019re more stable and burn with a slower velocity. You wouldn\u2019t want to load a cartridge with a primary explosive as the firing pin strike would simply blow up your gun, and that gets expensive. So, a cartridge uses a tiny bit of primary explosive in the primer that\u2019s volatile enough to ignite from a firing pin strike. This small bit of primary explosive sets off the much larger, and more stable, secondary explosive.<\/p>\n

Because any variance in this initial \u201cexplosion\u201d can cause a much bigger variance in the secondary charge ignition, it\u2019s important to use the exact primer type called for in published load recipes. Think of it like lighting a birthday cake candle. If you light a candle with a Zippo, you\u2019ll likely ignite the candle without an undue amount of melted wax. If you light the same candle with a flamethrower, it\u2019ll also light the candle, but the overall results will be dramatically different.<\/p>\n

With that said, let\u2019s get into the primer universe in a little more detail.<\/p>\n

Types of Primers<\/h2>\n

There are two basic types of modern centerfire primers: Boxer and Berdan. Ammunition made in the U.S. generally uses Boxer primers. Boxer primer cups have a small bit of primary explosive material inside the base. Directly above that is an internal anvil. When the firing pin hits the base of the primer cup, the unstable stuff is driven into the anvil portion of the primer, thereby igniting the primer compound. A flame shoots through the flash hole of the cartridge case and ignites the propellant charge.<\/p>\n

\"Boxer

Boxer vs. Berdan primers.<\/p><\/div>\n

Berdan primers rely on an anvil that\u2019s built into the primer cup area of the cartridge case itself. For lack of a better word, you\u2019ll see a little \u201cnub\u201d that protrudes into the primer pocket area of the case. Since the nub is in the middle, the flash holes have to be elsewhere. For that reason, Berdan cases have two flash holes on either side of the anvil. The primer itself has no internal anvil, so the compound is pushed against the anvil part of the case to cause ignition.<\/p>\n

Both types are technically reloadable, but Berdan is a royal pain in the butt. Fortunately, most (really all) of what most reloaders deal with is Boxer cases and primers. Those are easy to remove from fired cases. As the flash hole is in the center, a pin in the resizing die simply pushes the spent primer out the bottom of the case. Easy peasy.<\/p>\n

Primer Sizes<\/h2>\n

There are four sizes of primers for common centerfire cartridges: small pistol, large pistol, small rifle, and large rifle.<\/p>\n

Small rifle and small pistol primers appear identical on the outside, but don\u2019t use them interchangeably. Both are about .175 inches in diameter, and .120 inches tall, give or take a hair depending on brand.<\/p>\n

Large rifle primers measure about .128 inches tall and .212 inches wide, again give or take a bit. Large pistol primers are a touch smaller at .120 inches tall and .211 inches diameter on average.<\/p>\n

\"Just

Just because primers appear to the the same doesn’t mean they are.<\/p><\/div>\n

Magnum Primers<\/h2>\n

Within each primer size family, you\u2019ll also find standard and magnum varieties. We\u2019ll get into this more in a minute, but don\u2019t simply assume magnum primers are for cartridges with “magnum” in the description. As the name implies, they are designed to ignite with more enthusiasm. Normally, they\u2019re used in loads where the combination of powder type, powder charge volume, and case size create conditions where it\u2019s harder for a standard primer to properly and consistently ignite the propellant charge, whether or not it\u2019s a \u201cmagnum\u201d cartridge.<\/p>\n

As you peruse loading manuals and find various recipes, it\u2019s likely that you\u2019ll encounter calibers that call for magnum primers with some loads but not with others. One example is 375 Ruger. Most jacketed bullet loads for this caliber call for magnum primers, but lead bullet loads use regular large rifle primers.<\/p>\n

The bottom line is this. Rely on published recipes exactly. You might find non-magnum calibers that call for a magnum primer. Or the reverse. Just don\u2019t arbitrarily switch them on your own. Swapping a magnum primer instead of a regular can ignite a carefully calibrated charge way too fast and spike pressure to dangerous levels.<\/p>\n

Benchrest Primers<\/h2>\n

Benchrest primers are simply those made with extra-special care towards consistency. Any variance in primer ignition performance can result in pretty big differences in accuracy, velocity, and pressure.<\/p>\n

It\u2019s not unheard of for different primer brands for the exact same load to create velocity differences of 100 feet per second or more and pressure variance of thousands of pounds per square inch. Lyman\u2019s reloading manual references one primer test that resulting in variance of 9,300 psi just from swapping to a different primer brand.<\/p>\n

\"With

With a good rifle and carefully loaded rounds, you’ll almost certainly see more consistent velocities, and better accuracy, using Benchrest primers.<\/p><\/div>\n

Even within one brand of standard primers, there is going to be variance in velocity and pressure. The idea behind benchrest primers is that better primer to primer consistency will reduce that deviation, resulting in more predictable and accurate loads.<\/p>\n

Don\u2019t Assume Too Much From the Name<\/h2>\n

Like many other things in the shooting world, you can get into trouble assuming too much from the name. You know, like assuming that .38 Special bullets are .38 caliber. Hint: they\u2019re not. In the primer world, you also have to be careful about making assumptions. You\u2019d think that \u201cLarge Rifle Primers\u201d are always for \u201clarge rifle cartridges\u201d right? Well, not necessarily. For example, while most .308 Winchester loads use large rifle primers; I\u2019ve got a pile of Hornady .308 Winchester cartridge cases that were loaded at the factory with small rifle primers. Likewise, you\u2019ll run across Federal .45 ACP cartridge cases that use small pistol primers rather than large ones. Nothing\u2019s ever completely cut and dry.<\/p>\n

Some Primer Tips<\/h2>\n

Hopefully, by now you\u2019re convinced that primer selection is a big deal. Don\u2019t treat different brand and lots as interchangeable.<\/p>\n

If you are having any trouble with your priming \u201cmachines\u201d whether it\u2019s a hand tool, progressive reloading press, or something else, try a different brand of primers. As a very real example, my particular Hornady Lock-n-Load progressive press really doesn\u2019t like Winchester primers. Winchester primers are just fine, and I use them without hesitation. They just don\u2019t get along with that particular press, and they get jammed up more frequently than I would like. CCI primers work like a champ in that primer feed mechanism. My calipers aren\u2019t precise enough to pick up any diameter variance, so I assume the differences are related to the shape profile or maybe the nature of the metal on the primer cup. Just be aware that like anything else, there may be small differences from brand to brand. If you\u2019re having trouble, try another brand before throwing in the towel.<\/p>\n

If you\u2019re making plinking ammo and sticking to mid-range loads regarding pressure and velocity, it\u2019s not going to matter a whole lot which brand of a specific primer size you use. However, if you\u2019re going after maximum accuracy from your gun, invest some time making batches of similar loads with different primer makes. You might be surprised at the differences from that one variable.<\/p>\n

\"Try

Try to avoid handling primers with hands and fingers – that can interfere with ignition performance later.<\/p><\/div>\n

Avoid handling primers with your hands. Oils and such from your skin can interfere with reliable operation later. Most hand priming tools have trays that allow you to dump primers right from their box onto the tray without handling.<\/p>\n

Always wear safety glasses when handling primers. Remember the primary explosive part and how they\u2019re designed to go boom from mechanical force? If one gets jammed up and goes off, you won\u2019t want flame, gas, or primer bits going into your eyes. If you use a primer feed tube, as on a progressive reloading press, it\u2019s possible that some weird sequence of events can set off the whole tube, so be careful. Pretend like you\u2019re handling explosives, because\u2026 you are!<\/p>\n

While they\u2019re the little guy in the process, and usually the least expensive component of the reloading process, don\u2019t neglect the primer. Kind of like a stubbed toe, that little thing can make life miserable if not treated with respect.<\/p>\n","protected":false},"excerpt":{"rendered":"

SERIES Part 1:\u00a0Want to Reload Your Own Ammo? Basic Questions to Consider Part 2:\u00a0The Reloading Process Part 3:\u00a0The Gear You\u2019ll Need and What It\u2019ll Cost You Part 4:\u00a0Brass Cleaning and Preparation to Load Part 5:\u00a0Brass Resizing Part 6:\u00a0Trimming Cartridge Cases Part 7:\u00a0Repriming the Cartridge Case Part 8:\u00a0Powder, Propellants, and Pressure Part 9:\u00a0All About Primers Part […]<\/p>\n","protected":false},"author":25,"featured_media":58630,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_specdata_upc":"","_specdata_placement":"","footnotes":""},"categories":[7,256,252,113,95,209],"tags":[132,102,618,757],"featured":[],"hunt365":[],"class_list":{"0":"post-58609","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-gunsamerica-authors","8":"category-getting-started","9":"category-metallic","10":"category-gear-reloading","11":"category-ga-guides-reloading","12":"category-tom-mchale","13":"tag-buzz","14":"tag-feature-articles","15":"tag-reloading","16":"tag-reloading-guide"},"yoast_head":"\nReloading: All About Primers<\/title>\n<meta name=\"description\" content=\"Reloading: All About Primers - Authors\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gunsamerica.com\/digest\/reloading-primers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reloading: All About Primers\" \/>\n<meta property=\"og:description\" content=\"SERIES Part 1:\u00a0Want to Reload Your Own Ammo? 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