50-275 USD or so
100-500 or so
A while back there was a long action version of the Savage Model 12 (I think it was the 112BVSS) that was chambered in 7mm Remington Magnum. The last I ever really heard of them was back in the late 1990s. I've not seen anything about it since then. For now the only manufacturer that makes a bull barrel 7mm Remington Magnum is Remington, their Sendero line, as a matter of fact.
50-175 or so
50-175 US Dollars
100-300 USD
75-175
It will vary with the maker of the bull barrel.
Barrel diameter
I think the Raging Bull is in caliber .454 Casull, and sells for $750-$800 in Excellent condition.
100-500 or so
Do a search for Jarvis. They make a bull barrel for the $597, it runs $198 in either blued or stainless.