Thanks for the knowledgeable feed back guys.
I am aware anything above 320 g produces little effect with wood, but I had the bag with the finer + out so I thought I would give it a burl.
Results as reported.
I had U beaut but will keep it fr a more practicql use.
 Abranet yep it was used  along with its twin Mirka from Mallee Agencies in WA .
FWIW my next time wasting activity I was considering inlaying a couple into the small tables you see around my place to impress Shipwright!

 Any clues on the indented growth rings?

Regards Rob