went to clean my 300bo, went to pull the bolt out. would not move. finally got it out. looked in the upper. a crystal like substance was all over the inside. only thing that I did different was I used a used liquid wrench dry lube not rem oil (my got to gun oil) or a silicon based automotive lube (never had a problem with it use it in a pinch if I don't have rem oil). cleaned it all out using mean green then hoppes.
I have had some bad primer pocket issues but it was not dark. the crystal was close to the same color as salt. any ideas?