Seem to remember that someone here uses a .338/.416 Rigby Ackley Improved? This made me wonder if there are any limitations on which cartridges can be Improved upon? I guess shapes like those of the H&Hs arent really conducive, but how about, lets say, 7mm RemMag, 300 WinMag, or 308 Norma Mag? Anyone know where I could get reamers, if its doable? Thanks!