Hodgdon has .405 Win data with 300 gr and 400 gr bullets with pressure listed.

Check it out at:
http://www.hodgdon.com/data/rifle/405win.php

-Bob F.

From Hodgdon's weg page:

405 WINCHESTER
CASE: HORNADY BBL: 24" PR: WINCHESTER LR (WLR)

400 GR. WDLGH RNSN (Starting Loads) DIA. .411" COL: 3.085"
VARGET 48.0gr 1790fps 37,000 PSI
H4895 45.5gr 1801fps 37,100 PSI
H4198 33.0gr 1582fps 33,600 PSI

400 GR. WDLGH RNSN (Maximum Loads) DIA. .411" COL: 3.085"
VARGET 52.0gr 1928fps 44,300 PSI
H4895 50.5gr 1945fps 44,900 PSI
H4198 36.5gr 1718fps 43,400 PSI