Weird

Resizing some 257 Roberts and encountered a neck separation I don't recall ever seeing before. 3x loaded Nosler +p brass.
Glad it's not stock in the rifle.
I've only encountered that issue with 10mm, but more of a case than neck separation. I've even shot 357sig in a 40s&w and still hit the target at 50 yards. I could tell when it ejected that something was odd.
 
I’ve had more trouble with the little bit of nosler brass giving up the ghost prematurely than ADG and Peterson combined, in many more cartridges. No visible pressure signs then releasing the primer next firing for instance.?
Just screwy, with no warning.
 
I had something similar years ago .

 
I’ve had more trouble with the little bit of nosler brass giving up the ghost prematurely than ADG and Peterson combined, in many more cartridges. No visible pressure signs then releasing the primer next firing for instance.?
Just screwy, with no warning.
Nothing unusual. No shoulder growth to speak of new brass to once fired to resize, it appears the rifle and sammi specs all agree. Random checking shows just about .002 shoulder change on firing. Necks are lubed for sizing. Primer pockets are still tight, the pressure it takes to seat a primer with these is the same for several other cartridges, no other pressure signs, in fact I have loaded other cases to 257AI pressure but these were never loaded hot.
 
Don annealing brass is very easy and very simple to do, all you need is a propane torch, variable speed drill, short socket extension and a deep well socket that the brass will fit in, a damp towel to drop the brass on to cool the brass and a semi dark room so you can watch the brass change color which is the heat going down the brass just past the shoulder.
There's quite a few of U-tube videos on this and very easy to do. I have never felt the need to buy a case annealer or to use temp-lac.
Practice on old junk brass so you don't ruin your good stuff, it will take longer to set up then it will to anneal 100 pieces of brass.
 
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