I use the Alpha PPC brass and love it. I've shot it for the last 18 months or so including at the WBC with various loads of Vit 133, sometimes very hot, with no sign of pressure on the case and no problem with extraction. I also like the fact there is no need to fireform or hydroform the cases.
As always, for safety reasons, do not start with a hot load. Pay attention to powder manufacturers recommendation. It is very much dependent on your action, barrel, chamber, bullet etc.. what load is acceptable for your particular set up. Start low and gradually increase if required.
