The PMC offering is the original X bullet, while the Federal offering TSX is a newer offering by barneswhich many, including myself, feel is an upgrade from the original X-bullet. Reason why??? Less copper fouling with the TSX, faster velocity with a naked bullet and accuracy. I never used the x-bullet on anything other then paper but reports from the field are the TSX is more relaible in terms of expansion and would channel results, the x bullet has a reputation penciling thru. I have used the TSX and its performance has been top notch on elk and moose. The TSX carries the sameweight retention as the original x bullet so I can't see any negatives to choosing the TSX over the X- bullet.

BTW I handload 140gr TSX BT for my 7mm rem mag for elk and moose, thus only one bullet recovered from a bull moose which retained over 90% of mass and expanded over double orginal diameter (.714 if i remember correctly).The other 3 were clean pass thru which showed great wound channels and resulted in animals being down in very quick order. All single shot harvests.