Sarg-

Ken Waters used IMR 4320 on 270gr bullets, I have some of that here and a little bit of .444 brass.
I can believe the Keith loads may have been hot.

I'm thinking with 270s, 4330, and a chronograph, it should be pretty easy to keep things cool in the boiler room!
It's great that OldBrit has chrono data for us all from orig ammunition.
Interesting too, 444 brass and the Woodleigh make LS magazine length at the cannelure...

Cheers
Tinker