I don't see that as a fair comparison. I would size the Lees and use the premium lube, then draw conclusions.I have cast several hundred boolits with the Lee TL mold but to date have only shot 50 or so. They were cast from straight CoWW, lubed with a mix of Johnsons Liquid Floor wax and LL Alox and pushed with 9 grns of Unique. No leading but accuracy was just so-so. These were not sized, shot as cast.
My go to boolit is cast with a RCBS 215 SWC with the same alloy, sized to .410 and lubed with NRA Alox. Loaded with 9 grns of Unique. No leading and much better accuracy.
Both loads were shot in a Blackhawk and a Super Blackhawk Hunter with the same results in each gun. YMMV
They were not sized because they cast at .410. Throats on both revolvers are .4105, thus the .410 bullet. I have found nothing that works better than a mix of 60% Lee Liquid Lube and 40% Johnson's Liquid Floor Wax on a tumble lube bullet.I don't see that as a fair comparison. I would size the Lees and use the premium lube, then draw conclusions.