This is probably the only R rated record that Deadpool didn't have to itself (i think there are two more). As of now, Deadpool is the highest grossing R rated movie ever with $745.7 million by beating The Matrix Reloaded's $742 million worldwide.
Well, The Matrix Reloaded still hold the record for highest foreign total for an R rated movie with $460.5 million. And it will hold that as Deadpool has now grossed $396 million overseas and with Batman v Superman unleashed everywhere it is now on the verge of its end at theaters.
The domestic record for an R rated movie belongs to The Passion of the Christ ($370 million) and that is also out of the reach. The Merc with a mouth grossed $349.3 million domestic and is ending its run.
Biggest X-Men Movie Ever
It will soon become the biggest grossing X-Men movie ever worldwide by eclipsing X-Men Days Of Future Past ($747.7 million). And that is without even releasing in China where Days Of Future Past earned $116 million and also without being in 3d. The achievement is even bigger considering the R rating.
So, if it had China and 3d in the mix then it would might have grossed north of $850 million and might have snagged the above two records also.