It has been my experience that Tom will load to your request within reason. Also Lots of great information in his book.

If I am ever lucky enough to get one of these cannons I'll do the loading myself . But I seem to remember seeing a book somewhere he wrote about 4 and 8 gauge guns . I "assumed" wrongly or correctly that he had loads in it .

You can find toms book at Balistic products. At least that is where I bought mine.

And it has loading data ?

Yes

The book has about eight or ten different loads in it.