Brass, to be precise. One thing I've noticed on making cases for that .310 is that the shrinkage after the first firing isn't real consistent; some lose very little length, some a LOT.
Last 25 cases we put together, after first firing most of them went from 1.140 to 1.130 inch; a couple stayed around 1.140, and one went to 1.125. Previous results were similar on length lost. That rifle seems to shoot best with 1.130 or 1.135, so I think next batch we do will start at 1.145(which is about the max length at which a round with the 120-grain RCBS bullet will chamber in it), so hopefully will wind up at the 1.135 mark.
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