Messin' around with press and dies

[RAY]

I found the reason why to match the FL die to once fired brass.

Bottle neck brass will expand to the chamber shoulder and then spring back a little.
I believe this is why my once fired case still chambers in my rifle but its now closer to the chamber shoulder and matching this will keep it just right for headspace .

 

[ElmerThud]

I found the reason why to match the FL die to once fired brass.

Bottle neck brass will expand to the chamber shoulder and then spring back a little.
I believe this is why my once fired case still chambers in my rifle but its now closer to the chamber shoulder and matching this will keep it just right for headspace .

It will Ray, - many people try to achieve this by simply 'neck sizing'.

However, rather than going to neck sizing that will after a number of firings usually result in 'tight' chambering, with the need to then full length resize, your cartridges will always chamber easily.
The bonus with F/L resizing to fired case headspace dimension is: accuracy remains very consistent and especially so when a Lee Factory Crimp die is used to finish the job off.

After three firings I also anneal my cartridge cases and the combination of the reduced work on the brass case by only resizing max. a couple of thou. and annealing ensure the cartridges remain useable for many firings.
Unavoidably though, there does come a time when you have to start again from new! ATB ET

 

[RAY]

Thanks again ET !