Loss of neck tension?

[Oldschool280]

My 6.5 swede in which i use lapua brass is on its fourth firing. I added cabelas polish to the media when i tumbled them ( for 12 hours) . When i reloaded them the bullets ( 140 gamekings) went in nearly effortlessly on half of the batch. I grabbed the bullet and cant move it by hand. Thoughts?

 

[Canadian Bushman]

Are you sizing with neck bushings?

 

[Dosh]

Anneal time.

 

[243winxb]

Neck turned using bushings, i have to drop down 1 thou after a few firings. No annealing.

 

[Mikecr]

If all you did was reduce seating friction a bit this cycle, no problem.

 

[Oldschool280]

Are you sizing with neck bushings?

No sir i am not , also i am full length resizing . I need to get some more gear i think

 

[Oldschool280]

Anneal time.

I will do that today.

 

[Oldschool280]

If all you did was reduce seating friction a bit this cycle, no problem.

Cool thanx.

 

[243winxb]

Neck wall thickness may thin using a standard FL die that over works the brass.

Loaded some new brass in 243 win. Pet load shot better than normal out of 40x. Taking measurements, showed a loaded neck diameter of .276" maximun SAAMI. Not normal.

Neck wall thickness got thinner after a few loadings, then it stabilized .

Nect tension was never lost, only accuracy changed for the worst.

The morel of the story? Bushing dies are your friend. Redding Type S FL sizing bushing die for me.

 

[Greyfox]

I suspect that the 12 hours of tumbling with the brass polish could be a reason for the abrupt change in seating pressure. Not to say that your brass doesn't require annealing, but brass hardening(requiring annealing) tends to be more gradual when it comes to seating pressure. My guess is that you will definitely feel a difference in seating pressure if you anneal, but this generally happens, and it is frequently due to burning off residues that has accumulated on the necks inside surface, similar to the increased resistance of new, unfired brass when an expander is used. IMO.