July 9, 2018. The testing was apparently done with a homemade ballistic pendulum, which left a lot to be desired. Large Rifle Comparison Part II . Most rifle shooters, myself included, tend to view the use of a small rifle primer in a larger center-fire cartridge as a good thing. Test Procedure: Using a Lee Hardness Tester that measures Brinell hardness, placed a new primer on a piece of steel. And guess how soft the old CCI 300's are? Small pistol and rifle primers utilize a cup 0.175" in diameter, while large pistol and rifle primers measure 0.210" across. 04 January 2014. Using the large rifle primers as the example, mainly because that’s where I’ve found the largest discrepancies, switching primer brands in a particular load that is on the cusp of showing high pressure can easily push it over the edge. This testing was done to try and rank primers by power (brisance). This shows the pointer after a shot has been fired. ... Large Rifle Primer Comparison Part I. 625 Views. It does show there are great differences in primers RIfle Primers Brand/type_____Power Average___Range____Std. 14 Likes. Primer Testing Reference. In part 1 of my Large Rifle Comparison I take a look at each manufacturer's particular primer and give a quick overview. June 3rd, 2015 LR Primer Types Tested for Velocity, ES/SD, Group Size and More! My findings are .020" thick primers work fine with .22 Hornet type fare, yet .222 Remington Magnum through .223 Remington work BETTER with .025" thick primers. Does primer size matter? Here are the results of a test done to determine the brisance of primers. James Calhoun's "Chart" is generally accurate. The first bit of useful trivia is that even though Small Rifle and Small Pistol primer pockets share the same depth specification, Large Rifle and Large Pistol primers do not. Large Rifle Primer Comparison Part I. Nothing’s ever completely cut and dry. Primer Hardness Chart Update ... added primers that I picked up at an estate sale. 100% . If you shoot a .308 Win, or any cartridge that uses a Large Rifle (LR) primer, you should read an important new article by Laurie Holland in Target Shooter Magazine.Holland, a talented shooter from the UK, tested no less … Likewise, you’ll run across Federal .45 ACP cartridge cases that use small pistol primers rather than large ones. 6.5 Creedmoor small v. large rifle primer brass comparisons. For example, while most .308 Winchester loads use large rifle primers; I’ve got a pile of Hornady .308 Winchester cartridge cases that were loaded at the factory with small rifle primers. Small rifle primers, however, vary in thickness from .020" to .025." In this case, it was a Federal large rifle magnum Large rifle primers are 0.008" thicker than a large pistol primer. Most manuals call for small rifle primers, (specifically the CCI #400), but if you talk to long-time loaders (and silhouette shooters) using this cartridge you'll find nearly all use a small rifle magnum primer. The shot is fired against a weight which in turn moves a pointer. The standard pocket for a Large Pistol primer is somewhat shallower than its Large Rifle counterpart, specifically, 0.008 to 0.009 inch less. All large rifle primers appear to be .027" in thickness. Click Photo to read full test results in Target Shooter Magazine.. The pointer remains at the highest point of the shot. 2 Videos. ‘Berdan’ and ‘Boxer’ layouts and primer components. The Copper Pill. So, don’t take this as gospel but as a rough indicator. Large rifle primers all come with one brass thickness, a nominal 0.027” (unlike small rifle primers which vary from 0.020” to 0.025” depending on make/type). This is the home made tester. Held the indent ball on the primer for 30 seconds.
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