Pete, what Seafire said. The only brass you have to watch is military and some of the IMI match brass running around. It has a pretty thick neck (like .015-.017") and necking it down may make for a dangerously tight fit in a chamber. Measure the width of some fired brass out of your gun when you get it and that will tell you the answer. Either way you can size brass in one shot up or down. I shoot a lot of 308's so that's what I usually buy. I actually neck down my "culled" cases for the 260.
