Several people wrote about the Squibb-Miller bullet and the results pages in Shooting and Fishing show some remarkable scores.
There are ads for the bullet and the mold.
This link in Google books will get you started with details on the bullet and loads. Remarkable shooting for a little over 1,000fps.
https://books.google.com/books?id=gJ...page&q&f=false
Page 6 starts the article and the left column of page 7 has some answers.
Prior to this article there is some interesting stuff on Squib and his.30-40 Remington and the then the rebore to a .33 Pope muzzle load and shortly there after the rifle was for sale....