I would start with this-

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The 6A will get rid of the red tones but may also darken your piece. If the 7A is too light you can always go darker. If the color on the box looks just right always start with a shade or 2 lighter.

I use Wella Color Charm 672/7A (medium smoky ash blonde) and 10 volume developer on my #8 pieces and the color is perfect for me. On my color ring # 6 and #8 seem to be the same shade with #8 just having more of an ashy tone.

For a temp fix use ADF Grey Brown