I agree with Allen. I have shot X bullets since the late 1980's when they were still nearly unheard of. I have shot deer with them in 223, 22-250, 243, 270, 308, 300WSM, 300 Win Mag. I have host them in my 45 Auto, and my 44 mag. Also in sabots from my muzzleloader.
If I had a nice elk...