Magnum primer problem

[Innovative]

telesquirt,

I probably should add some pictures there to show "how much" is too much. Flat primers are the number one sign of chamber pressure going up.

It's caused by case pressure increasing enough to blow the primer FLAT against the bolt. When it begins to change the shape at the edge of the primer, that indicates increasing chamber pressure. Compare the primers on your fired handloads with fired factory loads, and you'll get the idea of what safe loads look like.

- Innovative

 

[303carbine]

telesquirt,

I probably should add some pictures there to show "how much" is too much. Flat primers are the number one sign of chamber pressure going up.

It's caused by case pressure increasing enough to blow the primer FLAT against the bolt. When it begins to change the shape at the edge of the primer, that indicates increasing chamber pressure. Compare the primers on your fired handloads with fired factory loads, and you'll get the idea of what safe loads look like.

- Innovative

Sticky bolt lift with extraction problems along with flat primers all indicate too high of pressure.