I've done it. I bought 800 or so cast bullets that had been stored in a hot shed and some of the lube melted off. I placed the bullets base down on a pie tin and added chunks of commercial lube (NRA formula Alox). Heated the bullets in 175 degree oven (wife was not at home) and adjusted lube depth by adding slivers of lube until the lube groove was covered. Thouroughly heated bullets for a few minutes (makes the lube adhere better). I made a 44 cal. "cookie cutter" to remove bullets from the lube after the lube had fully cooled. I also played around with making my own lube from beeswax, paraffin, vaseline, crayons, etc. Worked for me.