Just my $0.02, but I have never had good luck with the XTP-MAG bullets. The regular XTP bullets have worked consistently well for me in dropping white tail deer. However, the XTP-MAG bullets have consistently failed when shot from my 454 Casull, first they don't group well out of my gun and second every bullet that I managed to recover has shown jacket separation with minimal expansion. In short I trust the XTP but not the XTP-MAG.