Sawdust, is what get if you pressure cook the fish for too long, but on the other hand there is the a possibility of a dirt nap.

I have noticed that the prescribed canning time has been coming down.

I would not go much below 60 minutes at 10#, as I know of no survivors of less than 59:30 at 10#.

Dead men tell no tells.
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"The best argument against democracy is a five-minute conversation with the average voter."
Winston Churchill

"So it goes." Kurt Vonnegut jr.