Reloading Podcast 147 - primers don't go nuclear

Hello, and welcome to the Reloading Podcast here on the Firearms Radio network.  

Tonight the guys are talking primers.

  1. Does it really matter?

  2. Why different types?

  3. Why does it fall out after seating?

  4. Do I have to seat on the press?

  5. What about shotshells?



The hollow base pistol bullet acts a bit like a skirt on an air rifle pellet in that it creates drag and causes the bullet to stabilise better. ie drag at the back of a bullet pulls the back backwards and the dense front wants to go forwards.

Longer bullets (rifle bullets) are less stable which is why they need to be spun faster. As a bullet flies through the air is pressing back at a huge pressure. This makes the bullet try to tumble. Spinning the bullet makes it spin like a top and that gives it stability.

If you want, you can think of trying to balance a rod on a desk. The longer the rod, the less stable it is. You can give that rod stability by spinning it (like how spinning a top gives stability). The longer the bullet, the faster you need to spin the bullet to get that top spinning effect.

A 150gn bullet coming out of a 308 Win is spinning at over 200,000 rpm.

Regards, Charles


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