Oh, don't forget to use an outside neck turner. I bought my 7STW wild cat from a F1 bench rest shooter so it came with a 28 inch Shilen SS barrel. Neck turning brings the group size down.
All 300 cases that came with it were 375 H&H So I also used a 300 win mag to bring it down to near my slightly different STW custom RCBS dies. I used full power 175 gr loads to fire form.
Then when they split the necks after many reloads I band saw them off for my 458 win mag and 458 X 2 inch Barnes American.
So I will take all split necks cases