Ball/bullet size to bore diameter

[bigjack101]

I recently purchased a Tingle single shot pistol. There are no markings as to the caliber ,but I have determined the bore to be .429. What diameter ball or bullet mold would I need. A .401 bullet with a .15 patch seems OK, although the bullet I used is hard cast. Thanks for the help.

 

[eekjellander]

I would be using soft lead with a patch ,it"s what I do with a patched round ball and soft works with Lee REALS/most anything at BP velocities though I know nothing about your gun .