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JF,
I know you mentioned only using 180-200gr bullets in a 1 in 10" twist, but what about the Hornady RN 220gr flat base bullets? The OAL of the 220gr bullet is about the same as a 175gr Sierra Match King, and I've used those subsonically without keyholes nor baffle strikes. The fact that they have a flat base rather than a boat tail should help in their stability in a 1 in 10" twist. I haven't tried them yet, but just thinking out loud because I was looking and comparing the two bullets at the reloading shop last week.
I've always used bulky fast pistol powders like Unique and Red Dot. Red Dot works fine in the winter, but is VERY temp sensitive, and oftentimes goes supersonic on me in the summer. How much case volume does the two powders you mentioned take up (grain for grain) compared to flake powders like Unique and Red Dot? I was thinking of trying VVN310 or Titegroup next (supposedly case position insensitive).
What do you think?
Thanks!
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