Hi guys, I just joined the forum and have recently taken up casting. I just bought a Ruger SBH Talo in 44 mag. I bought a lyman 429421 mould and have mostly been casting 50/50, WW/pure lead. Also, I have been lubing the bullets with Lee Liquid Alox but not too much. The first 30 of my cast bullets did great with little to no leading. Just shot yesterday and after 35 shots had very severe leading in the last half of my barrel. The first batch of bullets was sized down to a .430 and barely did anything in terms of sizing. The batch from yesterday was not sized because they were dropping at .430 to begin with. The load itself is 10 gr of Unique with a medium roll crimp. I was wondering if the charge, lube, and the bullet were the same between the two test, why severe leading in the last batch? I also just slugged my barrel and got a .430 diameter with the cylinder throats being slightly larger but easy enough to push through with a pencil. Any ideas and or suggestions would be much appreciated. Thanks.