murray boots

i wear a size 11.5 in regular shoes... i've never had a boot actually matched with regular shoes sizes, so does anyone know if it runs large or what size i should get?

If you are closer to a twelve then go with the twelve, but you will want the closed toe bindings to fit tight or you will have the possibility of jamming your toes. Try them on if you can.

07 murray or earlier i would go 11
08 or newer (when that happens) I would go 12

I wear a size 10.5 shoe and my feet are wide and just tried on the 10's and 11's and I will be going with the 10's.
The 10's felt a little tight, but like all bindings, they will break in some.
The 11 fit pretty good, but I got some heel lift as they were a little to big.
Like Robert said, you want a snug fit with ct bindings, so I would go with the 11 for you.
If you have a shop to try them on at, then I would go try some on, if not hope this helps.

i have 08 and 07 in same size and the new ones feel tighter

I have 08 murrays and 11 feet and they seem like they have a little extra room in them. And, they happen to be for sale in the classified section if your interested. Never been ridden.