223 ai Redding seater problems

[Alan2791]

I’m reloading some 223 ackley improved Lapua brass Sierra 77 grn heads same load as normal only thing changed is I’ve annealed twice as I had a couple of split necks and now my seater die is leaving a groove/ring around my bullets any ideas what’s happened ?

 

[the prowler]

Did you size them after annealing

 

[the prowler]

I've had a 223ai. You shouldn't have split necks unless the pressure is high. How many times have you reloaded the case's

 

[Alan2791]

There on there 3rd firing I’ve been using 26 grns of N540

 

[Alan2791]

I annealed before sizing and before loading

 

[jcampbellsmith]

The neck tension is far too high, hence the rings on the bullets. Mandrel your necks to open them up a bit.
Regards
JCS

 

[Alan2791]

Just put the .222 mandrel back through second time and it’s sorted cheers

 

[Miki]

I’m reloading some 223 ackley improved Lapua brass Sierra 77 grn heads same load as normal only thing changed is I’ve annealed twice as I had a couple of split necks and now my seater die is leaving a groove/ring around my bullets any ideas what’s happened ?

Bullets, not heads.
Looks like your seating die is having to push those bullets in with so much force that you can see the cup/anvil marks.
I think @jcampbellsmith hit the nail on the head ...

 

[webley701]

I've had a 223ai. You shouldn't have split necks unless the pressure is high. How many times have you reloaded the case's

Pressures below the maximum ‘service’ pressure are more than enough to expand a neck as far as it ever can expend within a chamber. Even higher pressures can’t expand or work the neck to any greater degree, (i.e. to cause more frequent splits). Overly high pressures can of course cause failure elsewhere.

 

[the prowler]

Pressures below the maximum ‘service’ pressure are more than enough to expand a neck as far as it ever can expend within a chamber. Even higher pressures can’t expand or work the neck to any greater degree, (i.e. to cause more frequent splits). Overly high pressures can of course cause failure elsewhere.

What's causing the cracks in the first place? Poor quality brass?

 

[Alan2791]

It’s Lapua brass

 

[Alan2791]

Some of the split necks