An interesting test.
One of my shooting partners recently purchased a mould from mountainmolds.com that is basically a No Excuses 460 with a keith style nose. He runs them through his lubrasizer using a .501 die and lubes them with whatever lube he's using (not sure what it is). He get good accuracy with them like that.
He recently tried something kind of different. He had some Lee liquid alox lube laying around and decided to roll a few of his sized and lubed bullets around in it to coat them with the alox. On his next range outing he tried shootingseveral 3 shot groups with the No Excuses and several 3 shot groups using the home cast double lubed bullets. The home cast bullets were going into a very tight 1 ragged hole while the NE's were a still respectable 1.5" group. he was alternating between the bullets for each group so it was not bore condition causing the variance. Powder load was the same for both bullets (80gr I think). He shot a total of 10 home cast double lubed bullets and they all went into the same POI hole. He said the last one loaded as easy as the first.
I think its time to invite him over to the house for a day of bullet moulding and make sure he brings his moulds and lubrasizer with him, I'll supply the lead.