Reloading - too much pressure

[MoBoost]

This is what happens when you experiment with components.
6PPC, 26.0 grains of H332 - starting load for Lapua brass, loaded in Norma.
Flattened primer, light brass line above rim, felt the insides with a wire - sure enough feels like a "bump".

Looks like pictures in the book

Watch your brass for pressure - loaded again that would've been a mess.

 

[Calamity Jake]

That's why anytime you change something, reduce 10% below your listed load then work back up.

 

[rebelracer79]

Had an '06 case seperate like that when I first started reloading, luckily it was just in my die, good thing you caught it, I still have the die with the case stuck in it with no way to get it out

 

[HMFIC]

Looks like that case developed love handles...

 

[Blitzfike]

That type case seperation is usually caused by pushing the shoulder too far back when full length resizing.
The case gets pushed into the chamber a few thousandths by the firing pin and when it fires, the case
expansion grips the chamber walls and the case stretches back out to the bolt face.

I use case guages to verify that I have the die set correctly before I do a run of cases. This is especially
an issue with my Dillons. I recommend that you verify headspace with that batch of reloads.. Blitzfike

 

[MoBoost]

That type case seperation is usually caused by pushing the shoulder too far back when full length resizing.

The brass is virgin - but you might be right. I can see primer pushed 3-4 thou with reduced load - I might need to run through 6.5 expander and size back down to 6mm with false shoulder and blow all this brass out to chamber ... hmmmm.

 

[MoBoost]

Fireformed a couple of cases with false shoulder - SOB@@!!!!!! My chamber is 0.026 longer than Norma brass!!!

Good call - looks like I'll be doing some unloading and fireforming.

 

[Blitzfike]

Been there.. Done that.. Didn't get the T shirt.. Glad we caught it before you hosed all your brass. Good luck with the project.. Blitzfike