I'm trying to develope a load for shooting copper washed 159gr heads out to 100 yards.
I've tried Unique up to 8.0gr load and still shooting a few inches low.
I have GM3 powder, but not sure about loads at that distance.

I would like to get another powder to try, partly for perhaps a better load and these days I have found it's good to have a choice of powders in each calibre you load for in the event of shortages.

Any opinions on Blue Dot or Vhit N320 at 100 yards and what weight of powder?