I want to get one of these for my 12 FV. I know that the Ross is cut for the sporter weight barrel and I would have to widen the barrel channel a bit on that one but other than that, what are the differences in these two designs? I will be cutting the varmint taper barrel back to 21.75", I just want to know if the Featherweight will make it carry better or will the balance be all wrong?