If you have something like a wedding band, though, that pounding
will distort it and also change the ring size.
I have done traditional hammered finishes and I have never
distorted= or changed the size of a ring. When trying to match a
previous pattern of texture, I did distort a ring, and discovered
I could not get the depth of texture with a hammer. I have never had
a customer who wanted the traditional hammered look require anything
more than light repetitious blows covering the surface using a ball
peen end of a planishing hammer.
A small dapping punch will give you a smaller pattern, but not the
depth that a ball burr can do. I have had to refinish a repair where
the depth was only achieved with a ball burr to match the existing
pattern. I guess I would be picky, but I would not call a ball burr
finish a hammered finish, as you cannot get that finish with a
hammer. Changing a ring size two or three sized is like whaling on
it, stretching it 3/8th to 1/4 of an inch. Seems to me, if you are
hitting it hard enough to distort the object, you are forging it, not
decoratively texturing it, unless you forge it and retain the marks
as part of the design.