I would start off with new brass.... or make sure you anneal your used brass. Changing the neck of hardened brass doesn't work that great. I generally neck down- but I have necked up and have gotten the same results... (until I had problems with a 6.5-06, but that was a defective die). The reason I neck down is so that if a round ever gets fired in the wrong gun it wont be a big problem. When I was making my 6.5-06 brass I went with 30-06 instead of 25-06 for this reason. A .264 bullet in a 30 cal is a lot better than trying to send it down a .257 barrel. I don't think that i would do this- but if someone else just looked at the headstamp and managed to get it to chamber it could be a problem,,, but I would be surprised if a 338-06 would chamber in a 30-06?
As far as marking the brass.... I'd like to hear a good idea. I use a black sharpie- and it works ok. It will eventually rub off but it makes it through one complete reloading cycle and then i can reapply it.
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