I'm loading for a buddy's rifle and have the 168 and 180 Berger vlds. Also the 162 amax which he wants to shoot most. Powders of choice are h1000, h4831sc, Retumbo , r22, r25, IMR 7828 ssc , IMR 4350, h4350. I'm thinking h4831sc. But I'm new to the 7wsm loading and need a little help on which powder to use. Thanks