OK I finally got around to making some loaded rounds from the bullets I cast from wheel weights.
DSCF1123 by skipper_mso488, on Flickr
DSCF1122 by skipper_mso488, on Flickr
I loaded these over 4.5 and 4.8 grains of HP-38 if those look good I'll try 5.1 then 5.3 grains (5.3 is published maximum) OAL is 1.250. I really need to get a chronograph so I can quantify the results instead of just looking for signs of excessive pressure.