Step One:

Rough out the soft blank copper disc, using Air Power Hammer and roughing head.
(Sombrero shape...no Finnish-Latin bio name available).

Step Two:

Shrink edge with Hammer and Shrinking dies:
Make ruffle.
Shrink ruffle.
Shrink edge heavily.

Step Three:

Chase heavy shrink back into panel
Note quality of surface.

Step Four:

Planish: either leaving hammer spots (preferred for this)
or without (simple die change).

The bowl can then be annealed (just for stretching) and roughed through
again for a deeper shape.

Shrinking the edge may continue for a long time more before hardness
sets in.
....and the edge thickness? up from .062"? Yep, to .070". Seems pretty well shrunk to me, too.

For more information see our Copperworking Page