I have a T/C Omega in .50 cal with a Precision Rifle breech plug and a Bushnell Elite 3200 2-7x32mm. The stock is kind of flimsy on it; Ian Roberston said he may be able to make one of his hunting stocks fit it.
I also have a medium bore, a Ruger #1H stainless with a 1" decelerator pad and a Bushnell Elite 3200 3-10x40 short mag scope. It sure as h**l does not feel like a medium bore when it goes off, but I guess that is what it would be considered.