Al-7 was a fairly slow burning powder used for 1-1/4 oz and up loads in the 12 and 7/8 and 1 oz in the 20. If you can find an old Lyman 'First Complete Edition' hand book you will find quite a few loads for the old Alcan powders. I am still working on a large can of Al-5 that I picked up at a garage sale a while back. Hs-6 and Unique are still common so there should be lots of data out there for them. Most of the data I have for these seem to run higher pressures, though. I still have some old Alcan Flite-Max wads in the basement.
C.G.B.
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