Re: Load Development and Seating Depth
Your last question first. No, working up a load using another powder if Varget is your preferred choice will do no good. You need to work up a load for EACH different powder. Hodgdons, IMR, and AA all make a 4350. While similar, they all have different burn rates and one CANNOT be substituted for the other. Working up loads in other powders can be beneficial in 2 ways. 1,You might find another powder works better in your rifle and 2, if varget is not available you can resort to the other powders you have loads for.
First question. I will start with a predetermined COAL and load rounds in .5gn increments. I then take the 2 most accurate and work with them adjusting both COAL, (.002 closer to lands) and charge weight, (.10gn increments, starting .30gr below initial charge), until I find the "one". Remember to always check for pressure sighns after each firing.