Hi, David -

Good to see that you are over here (Nitro Forums), too.

We have been using the 350gr. RCBS cast almost exclusively in the .416 Taylor. The mix is 9-parts WW and 1-part Plumbers Lead (also known as 50/50, or Plumbers Solder). Using AA-2015 powder (sorry, I know you can't get this one down there) they move out right at 1800fps, are phenomenally accurate and (so far) show absolutely NO signs of leading whatsoever.

Take it easy...

Reggie