That is one big hunk of *****(cat). I have hunted bobcats, even owned one back in the 70s when it was legal. He was a big cat (at 35#) and the meanest critter I have ever tried to domesticate, still got the scars. Yours is a really close record. I do not believe it is a cross breed, I think the hair tufts are right where they should be, of course I am not an expert. I think it was just a well fed cat.
I really like big cats, wolves and bears. And any time I can spend watching them is time well spent. I haven't hunted them for a while as I have near records in all of them, including AK Brownie.
This does not mean I would not have taken a 50 pounder though! And I will dispatch any who are preying on my local deer population, I have got my grandkids addicted to venision, cheaper tham happy meals at Micky Ds.
Congratulations on a great wheelgun shot, if you would, I would appreciate more info on your conversion. cause I have a M16 4" with 32 mag and an extra 32-20 cylinder that is just a smidgen short chambered for .327 mag.