Most 35 Whelen dies will have a tapered expander ball. I've run .270s through mine just for fun and even they work.
If for some reason your die doesn't have a tapered expander; or if you feel guilty loading up the stem like that, seat a spire pointed bullet upside-down in a 30-06 case and pull it again. Bullets are cheap and besides you can use the same one over and over. I've used them for all sorts of oddball necking up operations.
If for some reason your die doesn't have a tapered expander; or if you feel guilty loading up the stem like that, seat a spire pointed bullet upside-down in a 30-06 case and pull it again. Bullets are cheap and besides you can use the same one over and over. I've used them for all sorts of oddball necking up operations.