Looks like 12 grains is a safe beginning point.
Here's a place to start reading:
https://castboolits.gunloads.com/showthread.php?406597-a-little-help-I-inherited-a-500-...
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I have started to try to load for my late sons .500 GNR
- Lynn, 2021-11-09, 17:46
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- I have used 14 grains of HS-6 for a 300 grain 44 Mag (nm) - Gary Reeder, 2021-11-10, 09:45
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500 GNR + HS6
- backroads rambler, 2021-11-10, 09:28
- forgot all about that :) that is me- (nm) - Lynn, 2021-11-10, 14:51
- I have AA1680,H4227.H110 only . (nm) - Sean Harper, 2021-11-10, 06:25
- thanks Sean (nm) - Lynn, 2021-11-09, 20:16
- Let me look , my loads are at the office. Tomorrow morning I - Sean Harper, 2021-11-09, 18:35