Saw a crazy rifle today "243 RUM"

[300 RUM]

I talked to a guy today I mention I had a 300 Ultra and he grinned and said "take a look at this"

He showed me a Rem 700 action with a 28" fluted bull barrel and a crazy tactical stock. Fully adjustable length of pull and cheek piece. There was not much of a forearm it was about a 11/4" round like a pipe and you could see 90% of the barrel. Just the last inch or so as it entered the reciever was covered. The only marking were on the barrel ".243 Phoenix"

This was obviously a custom built gun, the guy said he got it in a 10 gun trade. This guy was a few cards short of a full deck. He had 3 50 caliber rifles, at least 8-10 bushmasters, several H&K MP3 and every other tactical rifle you could imagine.

He didnt have any loaded ammo for it but had a box or so of brass that said 300RUM on the cases. Then he had a box of bullets. These things were the longest bullet I had ever seen. I would have to guess they were like a 130-140 grain .243 diameter. he offered to sell everything to me for $800.00

I would imagine by the looks of it its was several thousands of dollars to build this thing. If I had the cash I thing it would be one hell of toy to play with.

Just curious if anyone had heard of such a wildcat cartridge.