I'll keep this short. I have a 110 (pre-Accura trigger) in 7mm Rem Mag that I may want to rebarrel to 7-08 or 243. I know the bolt face will need to be changed. How difficult is this? While I'm no stranger to mechanical work or light gunsmithing, I've never tackled this job. BTW, the rifle is a LH bolt, if that matters.