Joe -- yes. 2 same size SP iserts
Brian -- so you are obviously using a 0.0001 mic? are you weighing primers too?
a tenth (0.0001) diff in bearing surface would probably get lost is the noise of differential friction in your rest/bag setup, or primer goop, or flashhole diameter/consistency, or mirage/thermals or light conditions, or wind, or ...
YMMV,
JB