I had 2 neck separations in some 308 I was shooting out of my M1A the other day when I was trouble shooting another issue.

Lapua 308 hand loader with 150 fmj.

I segregated the Lapua rounds and moved on.
I pulled them today and found verdigris inside almost half of them.
I took one and smacked it to flatten the mouth and the neck snapped off. I proceeded to do this to the rest of them, and all of them cracked where there was green.

The powder was AA2230-S (for 223 and 308).
I don’t reload when the humidity is up or when it’s raining as I reload in the garage.

Anyone know why it would do this? None of the powder was clumped.

The only thing I can think of is to anneal the cases. Renew the ductility of the cases.
Even if it’s just the “bubba holds the case in a socket and apply the torch” cheapo method.
I picked up a Burstfire annealer but haven’t put it into production yet…that will be soon! Hope you find a fix soon.

+1 on annealing and brushing the inside of the necks prior to bullet seating. A bit of similar issue discussed here.

I do anneal. After I clean and size, next step is anneal(except pistol ammo)

quote:

Originally posted by MikeinNC:
I do anneal. After I clean and size, next step is anneal(except pistol ammo)

You size before you anneal????

I misspoke, I deprime, wet clean, dry, anneal, then lube and size.

On my 17 hornet I anneal after sizing because I had a buncha case crumple due to it being so thin.