Re: 300 ultra mag with 190 to 220 smk data needed.
Both my rifle and I liked H-1000. Was plenty fast and accurate from a Rem 700 LSS.
200g SMK, 94g H-1000, F215, 3200fps, 1/2 MOA
220g SMK, 89g H-1000, F215, 3000fps, 1/2 MOA
200g AB, 95g Retumbo, F215, 3250fps, 1/2 MOA