I just neck size the fired case completely then run a slice down the centre of the neck with a thin hack saw blade. It holds enough pressure to keep the projectile seated once you find the lands but no chance of it getting stuck in the rifling. The I adjust the die ever so slightly so it's just off the lands.
My son has a T3 and runs 80gr TTSX with 2209. Put one into a nice 8pt jap just under the back bone at the base of the neck. Did some incredible damage to the shoulders.
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