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.

 

[rifletuner]

ADI who make Retumbo (sold as AR2225 powder in Australia) list loads for the 416 Rem with a 400gn bullet, but the slowest powder they list is H4350 (2209 in Australia). I dont think you could possibly get enough Retumbo in the case of the 416Rem.

Similar story with the 460 WBY, but ADI lists up to H4831 (AR2213SC in Australia) with 500 and 600gn bullets. You could MAYBE get enough Retumbo into the 460 to make it work, but dont think it would be worth the effort.

ADI dont list data for the 500/416, but it would be the same situation. Retumbo burn rate is just too slow.

 

[analog_peninsula]

Retumbo isn’t too slow in the .500/.416. I’ve used Staball HD more or less successfully, which is supposedly slower on Hodgdon’s latest burn rate chart. The only real question is whether the load will regulate successfully. In my rifle, I’d start at 100 grains with a conventional 400 grain bullet, chronograph, and go from there. Without knowing whether your rifle runs hot or cold, I can’t make a more specific suggestion.