General rule of thumb is 1 caliber depth into case so a 30 cal =.308. This would be in addition to any BT taper so .308" + taper.
P. S. Note: Just be aware about neck tension, COAL and Jam. One could possibly end up seating bullets that, with poor neck tension, could leave the bullet in the lands and dump powder everywhere, if one has to unload, a real MESS.
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