Yup,you should find one good load for Wt out those bullet choices.
Personally,I would use a 100 gr bullet,like a Hornady,Sierra or Nosler,just mudding up the waters even more.
I've read that 100 gr. may be the optimal bullet wt. for the Roberts, often shooting the best groups. We'll have to see about that. I could live with 100 gr. and don't think WT's will be able to tell a difference.
