Speer 240gr pn 4457 and Viht. 340 in .44 mag?

[IMtheNRA]

Speer manual uses Viht. 350 and the Viht manual uses 340, but with the Hornady bullet. I'd like to see if I can use Speer 240 gr JSP with Viht. 340.

If anyone has some load data they would like to share for this particular combo, that would be great!