Sterling Silver headpins

Yes, I’m sorry to say, it is another annoying newbie question. I
hope you all can help though, I have experimented way too much with
this - to no avail. I have been making ball headpins with fine
silver very successfully, but am unhappy with the softness of the
silver. I would like to make the same headpin with Sterling, but
cannot figure out how to do it without the ball getting “pitted”. Is
it possible to get the same smooth ball with Sterling as with Fine
Silver?

I use a Mapp Gas torch, but also have propane and butane available.
Thank you for any help you can provide.

Allison Birney
LouiLoui Designs