RETUMBO POWDER

[jlb1036]

I'm looking for loading data with retumbo powder for the following calibers and bullet combo

1. 416 rem mag 400grs
2. 500/416 400 grs
3. 460 wby mag with 400,450,500 grs bullets
if anyone has any loading data willing to share is highly appreciated
thank you

 

[meigsbucks]

I may be wrong, but Retumbo seems a little slow for those rounds. The .416 Rem usually takes powders like H380, H4350…
The .460 slightly slower: H4831, H4350.
No idea about the .500/.416.