Some few years back there was considerable talk of buffering with white flour & some very tight patterns were reported. Several well known writers were espousing this practise. Then Don Zutz ran an article showing a very real probability of the flour crusting & sticking on the inside of previously fired plastic cases & raising pressures to a dangerous level. Should you see this recommended "Please" Do not Try it. Only use recommended buferig mat'l with lab prepared data.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra