I got my Lee mould modified as suggested...I left enought of the third grove to make it somewhat beveled at the base.
Man o man...that is still one big bullet!!! 350gr with 1/2 pure lead, 1/2 "hard cast" scrap miester bullets. (makes about 30:1)
It seats to 1.625 on the front driving band. (which is supposed to be PERFECT for the Taylor's Spencer)
Here is a pic of the bullets. (thanks to Hell-Er High Water)
The 1st bullet on the left is an freshly cast 350gr .515" bullet from the modified Lee mould.
The 2nd bullet from the left is one from a similar mould, but, resized courtesy of Hell-Er High Water.
[sizing it removes the front driving band]
The 3rd bullet is from the Ripine mould, again, courtesy of Hell-Er High Water.
And the last piece of eye-candy is the finished product. (this one is actually just a display unit...Lee bullet, starline brass at 1.625" OAL)
Thanks again to Mr High Water for his help...