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The Range
Ammo & Reloading
Primer pocket flash hole variations
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<blockquote data-quote="HMFIC" data-source="post: 1624199" data-attributes="member: 7539"><p>There isn't any doubt that you'll see velocity differences between big and small flash holes. It's an interesting test to see exactly what the difference will be in that scenario though.</p><p></p><p>Flash hole uniformity is about making sure that the primer pocket is flat, round and consistantly holds the primer in the same flat and even position relative to the flash hole. You want the primer to sit perfectly flat on the brass so it's not canted and that when the firing pin hits, it doesn't allow any movement from the strike either. Deburring is to make sure that you remove any burrs on the actual flash hole, the idea is to deburr without increasing the size of the flash hole. The whole set of actions is designed to get you a clean and consistant ignition. </p><p></p><p>It WILL make a difference if you're using brass that needs it done, but then again you have to be able to hold and read wind before you realize it.</p></blockquote><p></p>
[QUOTE="HMFIC, post: 1624199, member: 7539"] There isn't any doubt that you'll see velocity differences between big and small flash holes. It's an interesting test to see exactly what the difference will be in that scenario though. Flash hole uniformity is about making sure that the primer pocket is flat, round and consistantly holds the primer in the same flat and even position relative to the flash hole. You want the primer to sit perfectly flat on the brass so it's not canted and that when the firing pin hits, it doesn't allow any movement from the strike either. Deburring is to make sure that you remove any burrs on the actual flash hole, the idea is to deburr without increasing the size of the flash hole. The whole set of actions is designed to get you a clean and consistant ignition. It WILL make a difference if you're using brass that needs it done, but then again you have to be able to hold and read wind before you realize it. [/QUOTE]
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Primer pocket flash hole variations
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