H4831 seems to be the choice around here. H4831 and Fed 210M seems to give the lowest ES. Some use H4350, but it is thought H4350 isn't the best choice with Fed 210Ms.
I have tried both H4350 and H4831, and they both shot the same with similar ES. I picked H4831 because it fills the case more. However, when I up the powder charge, H4350 and Russian primers may be the ticket.........
