I'm not too keen on getting up to 2000 fps and above. It would seem that I'd be fighting lead fouling constantly. Granted, I've heard the discussions about driving cast bullets very fast from both perspectives and choose to just not go there if my loads will get the job done below that threshold. I've shot many cast bullets at 1100 up to 1600/1700 fps without any undue issues. If my cast loads will perform acceptably at <2000 fps then that's where I'll be.