Many reloaders , neck size only, to avoid setting back the case shoulder. This is believed to extend the life of a piece of brass, because it is being worked less. Everytime it's used it's fireformed to the exact dimensions of the chamber. I believe that belted cartridges have a shorter safe lifespan because the sizing operation stops at the belt, and the chamber accommodation for the belt creates another stress point, so the failure point is often right in front of the belt. Some brass is better than others. Norma and Lapua brass have lasted longer for me, but are the most expensive. They use a slightly different alloy than American makers, which is slightly thicker and less brittle. With Remington brass I was only able to get one factory equivalent reload and the primer hole stretched so far that it would not hold a primer. I only loaded ten of those and ended up pulling bullet on eight of them. Oh, I reload for 300 WBY. 340 WBY, 223, 44Mag, 6.5x55. On the 223 I was careless with brass separation, large volume shooting, and payed for it. There is a learning curve, and you will learn to spot a suspicious piece of brass. Sometimes there is shinier ring in front of the case rim, where failure would occur, that brass should be removed from the supply. in 44 years of reloading I have had 2 casehead failures. Both were in rifles solid bolts and solid receivers: Rem 700 7mag. MKV 340 WBY, both actions are as advertised three layers of steel and no damage was done to either rifle. I am suspicious of some rifle makes in Mag chamberings that lack these features, SAvage, Tikka, to name just two. It may not be an issue, but I like solid steel between me and 65000PSI.
