Specifically with 2400 and 500g lead, seems to be little to no data floating around I know someone has data worked up… Anyone ?

Agent 141

Welcome to the Forum

Possibly you are having trouble because 2400 may not be a good choice for that cartridge and projectile weight.

In 4 decades I have never used 2400 so I will not be much help

I have gotten the best results with my 510 grain wadcutters using AA1680. You can load 46 grains and not exceed pressure limits (getting close) while the projectile hits around 1700 FPS depending on which barrel length you are firing.

Email Alliant powder's customer service. They have helped me in the past. I now have an accurate Green Dot load for my J-frame.

__________________
Do it outdoors

I know you are suggesting 2400 but a look at what Hodgdon has to offer in your bullet weight gives you multiple choices in powder use if the Alliant offerings don't work out.
Karl

2400 not the best choice for that bullet weight

Have not used it with 500 gr. lead

results from Jacketed 500 gr. jacketed

500gr XTP Mag-32 grains (case fill is about 88%) produces about 55kpsi and 1425 fps- would consider max for this bullet
(tested with 8" pressure barrel)

as suggested below 1680 a better choice

As a side note Vhit N110 produces good results with lead bullets across the entire weight range (300-720 gr.) in 500 S&W.
100% case fill with any lead bullet pressure will not exceed 52kpsi and produce reasonable velocity. All loading's will shoot very clean.

Good luck and be safe
Ruggy