Shot some 338AX rounds loaded with 100g Retumbo under a 300 Berger lit by a 215M. These had been loaded last spring with no pressure signs evident upon shooting at that time. I use dry lube in the necks before seating. Now they are showing pressure signs with every shot. Temp controlled as I keep them in a 40F cooler if I'm shooting in warmer weather than that to try and simulate more typical hunting temps in an effort for consistency. Haven't gotten the over pressure loads over the chono yet. I decided to pull a bullet to see if I somehow put too much powder in. Right at 100g with same scale--checked with flashlight to make sure no powder left in case. But, to measure this, I had to wack the edge of the case head pretty hard several times to loosen the powder so it would drain out. Only one kernal came out before doing this. What is going on? Is this contributing to my over pressure issues? This is the second 8lb jug of Retumbo that I've had clumping. When I called Hodgdon several months ago, their tech said it's not a problem, but that was before I had this overpressure issue after having powder sit in the case for several months. Perhaps I should give every loaded case a couple of good wacks on the edge of the case head...??