A precision bolt action rifle is not an "area affect weapon" designed to give a cone of fire and produce effects on the beaten zone. Unless you can demonstrate that anything Bart B. wrote is categorically untrue, you might want to rethink your assertion that extremely consistent ammunition for an M134 Minigun has anything to do with accuracy. There is a reason that M80 machinegun ammunition was redesigned for the M134, and that Mk316 Mod0 was designed for precision rifles. One is consistency of ignition, the other is consistency of precision.
I would like to remind you that we've been over this before, so it isn't like anyone here is ignorant of how primers work, or how to get maximum accuracy by choosing a particular primer over another for a particular powder.
Read these again, http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA341390
and here http://www.dtic.mil/ndia/2009infantr...ioniii8524.pdf
for a graphic illustration of why a hotter primer (faster ignition) may in fact provide more consistent ignition but worst accuracy (more consistant pressure curves).