Originally Posted by Mule Deer
Originally Posted by rickt300
That sucks, I have necked up 40 or so cases of 243 to 260 and have yet to see anything resembling a problem.


As mathman noted, it doesn't always occur, but can after a number of firing/sizing cycles. Which is why I eventually started necking .270 cases down for my 6.5-06, rather than necking .25-06 cases up.


Well I am going to watch that brass. I have annealed the first 20 pieces I got hold of, actual antique Remington 140 gr. Factory ammo. Each piece has been fired at least ten times.Retired. But the 40 or so pieces of Winchester 243 brass necked up is expected to last ten firings also so I will watch for the creeping doughnut. I hated doing it but I necked down a box of 7-08 Winchester brass to 260 and also some PPU 308 brass and another 20 rounds of Federal 308 brass. All have been loaded and fired at least once. Though presently I have slowed my primer popping down a lot.

Dog I rescued in January

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