As others have said,
Be sure you have enough neck tension.
Lead would probably be best.
If the bullets are soft enough, or the load is brisk enough,
You will get enough obturation to seal and spin.
Or, you could overdrive the alloy.
I would certainly try.
Also, faster powders might be better.
Unique is my stand by, the only thing I have used much of
in its class. It has a reputation for hitting bullets hard enough to
bump them up. Haven't used other powders, so I can't compare.
