Many primers for components come with a small disk of paper sandwiched between anvils and a priming mixture. It is referred to as foil paper. it covers a pellet for priming and serves as a manufacturing efficiency. The anvil is not visible in this picture to provide clarity. The little items we're not able to live without are difficult to come by at the moment. The problem will go away in the event that this trend is similar to previous trends. It is important to be aware of the obscure facts about primers prior to we worry about having enough. I'm sure that most readers are aware that the 209 primers has more than one job. Alongside creating a spark that ignites propellant, it provides an initial an increase in pressure to assist the propellant reach self-sustaining combustion. It's also part of the sealer system in the case that helps keep hot gases behind the bullet, and out of the way. It is the U.S. handloaders can choose from a wide range of primer sizes and functions. There are two sizes available for rifle and handgun. Size is EverythingThe first piece of interesting facts is that although Small Rifle and Small Pistol primer pockets share the same depth specifications, Large Rifle and Large Pistol primers do not. Large Pistol primers have a standard pocket that is 0.008 to 0.09 inches smaller than their Large Rifle counterparts. This was noticed by many handloaders as the "mega-magnum" handgun cartridges, appeared a couple of years ago. The original cases were designed for Large Pistol primers. Reloaders who were reloading decided to change to Large Rifle primers to better handle the high pressures, and they found the rifle primers stood proud of the case head, which was an unpleasant situation in the case of a revolver with a high recoil. Primer Equivalency There have been numerous articles written about the different brands of primers compare. Tests to test the impact of primer substitution have been written about for years. I've been a lab animal for long enough to realize that the road is filled with potholes. We received a lot of requests to include an primer chart to the Speer manuals that I created to show what the different primer manufacturers call their primer kinds. It is not possible to find such charts in my manuals. What's the reason? First, switching the brands of primers from those we used in the manual could create dangerous conditions. Another issue is the accuracy of the information. A table of sizes for primers and manufacturer numbers was included in one of the Speer manuals that I was previously in charge of. Just before the first edition was gone, a company completely changed its numbering system and the foreign brand that was listed went out of business. The hardcover book can be like engraving things on stone. I didn't want a chart that might become outdated prior to the publication. Similar to the argument about "which is hotter/colder" There is a similar problem: primer specification changes. CCI redesigned its whole primer line in the year 1989. We made sure that the new primers could use load data that was created by the previous versions, but not every change is announced. Another example is when another primer manufacturer introduced a change that affected the outcome of a test that was performed by a colleague of mine. Here's an example of a print error which is taken to be a gospel truth: The reloading manual of another company contained the primer number chart and types that incorrectly portrayed the CCI Benchrest primer as compatible with the CCI Magnum primer. This was repeated in numerous versions of the manual, until we finally persuaded the company to correct it. Some would contact CCI and insist that our Benchrest primer was a Magnum because it was printed that way in another company's manual. Magnum Primers: Use As Directed Numerous primer companies offer an ordinary and Magnum version of their primers, in any size and application. The Magnum primer is more powerful to handle the most difficult ignition situations. A huge capacity case, an extremely deterred propellant, or extremely cold weather (less than 20 degrees Fahrenheit) typically makes the 209 primers desirable. Bottom line A primer performance equivalence table is likely to be obsolete by the time I publish it this day. Some poor soul will try to replace primers that have been based on false information. My editor suggested recently that I perform a primer test using a handgun. I'm sorry for this suggestion. Use current and published load recipes.The Mysteries of the All-Important Primer Most component primers have small pieces of paper between the anvil and the priming mix. Called the foil paper, it covers a pellet for priming and is simply an efficiency in manufacturing. The anvil is omitted in this image to make it clearer. The little items we're not able to live without are difficult to find at the moment. If this trend is similar to past patterns, it'll pass. It is essential to be aware of lesser-known facts regarding primers before we get worried about not having enough. Most readers will know that the 209 primers perform more than one thing. It provides a spark that can ignite propellant. It also provides an increase in pressure that will enable propellant to achieve an self-sustaining burning. It is also a part of the case sealing systemthat keeps hot gases out of your eyes as well as behind the bullet. U.S. handloaders have a option of primer sizes and purpose. There are distinct versions for rifles and handguns. Size Matters The first piece of interesting information is that, even though Small Rifle and Small Pistol primer pockets have the same depth, Large Rifle and Large Pistol primers don't. Large Pistol primers have a standard pocket that is 0.008 to 0.09 inches smaller than their Large Rifle counterparts. A number of handloaders discovered this when one of the "mega-magnum" handgun cartridges was introduced some time ago. The original cases were designed to accommodate Large weapon. Some reloaders decided to switch to Large Rifle primers to better handle the high pressures, and they found the rifle primers were soaring over the head of the case, which is unsettling in a high-recoil revolver cartridge. Primer Equivalency Numerous pieces have been published about the different characteristics of primer brands. Over the years, there has been testing to determine the effect of primer substitution. I've been a lab animal for long enough to know that the roads are filled with potholes. We heard a number of requests to add a primer chart in the Speer manuals that I wrote about what primer makers call their primer kinds. You will not find the charts in my manuals. Whyis that? In the first place, it can result in a hazardous situation if we change primer brands apart from those listed in the manual. The second concern is the accuracy of information. One of the Speer manuals prior to my taking over, printed a beautiful diagram of primer sizes as well as the manufacturer's numbers. Almost before the first printing was sold out, one company completely changed its numbering system and a brand from a different country was not listed. Hardcover books are similar to engraving in stone, and I did not want a chart that may be obsolete before the book ran its course and caused issues. Similar to the argument about "which is hotter or colder", there is a similar problem: primer specification changes. CCI changed the entire primer line in 1989. We made sure that the new primers could use load data that was created by the previous versions, however not all changes are announced. Another example is when another primer manufacturer changed their design that changed the results of a test conducted by a close friend of mine. Here's an illustration of an error printed in the manual which was taken to be gospel. A list of primer types and numbers was published in a reloading manual for another company. It incorrectly indicated that the CCI Benchrest primer could be interchangeable with the CCI Magnum primer. This was repeated in many editions of the manual until we finally convinced the company to rectify it. People would call CCI and demand that the Benchrest primer was Magnum. Magnum because it was printed that way in the manual of another company. Magnum Primers: Use as Directed Most primer makers offer the standard and Magnum primer for every size and for each. For challenging ignition situations for difficult ignition situations, the Magnum primer is stronger. The 209 primers are perfect for large-capacity cases, highly deterred propellants, and extreme cold temperatures (less that 20 degrees Fahrenheit). Conclusion If I publish an equivalence chart of primer performance in the near future, it'll be obsolete, and some uninformed person might try to replace primers based on incorrect information. My editor suggested that I conduct a handgun primer test. I am sorry for this suggestion. Stick with published and current load recipes.
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June 2022
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