I'm using a rcbs charge master. Getting good consistent results with rs50 with me .308. use the same scales for all me other cartridges that I have reloaded. The magneto speed was used to load develop for the .308 with both rs50 and n140. Never had an issue. I did think it was quite fast at that powder charge.
I went with someone else's recommendations on power charge for same powder and bullet. They are using 86grains and getting 3000fps plus