by Hilux2003 » 11 Mar 2014, 9:32 pm
Some times you may need to "reduce the mandrel diameter" to acheive a consistent neck tension, particularly with different batchs of brass, so a second (or third mandrel, labelled, would be approproate, each a thou or so different).
I do modify the factory dies & mandrels in the Lee Collet Die range.
6.5x55, .303British & .223Rem - so far & all required "some mod or other" to function the way I wanted/settings/ease of use/reason.
The Lee Dies are so cheap and are reliable once set up properly, a second set is no great expense for a different batch of brass.