I shoot 355gr. cast gc bullets that group under 1" at 100yds, and just got finished testing some loads for the rem 405 gr. FN bullets that bored one hole at 50yds this past weekend.
I haven't tried them at 100 yet, but I would be satisfied if they stay under 2", but the reality is they should be around 1 to 1-1/2".
I have not found anything yet, that is not accurate out of this gun, cast or jacketed.
Good shooting.