Good point. I have plenty of the older bullets also. In 429,452,458,and 500. I have not bought from them since about 2015 or maybe longer.
I would think that with no lube,even the hard lead would easily strek your bbl. I don't cast them,or know much about them,I just shoot them.
BTW . . . I have shot some outstanding groups with these (Cast Performance) bullets. MOA @ 50 a bunch of times with different guns,with scope set at 4X or 7X. --- SAWMAN