Mram10us you asked what do I use a rifle vise for.
To hold the rifle still for scope mounting,cleaning and if something needs lapping that is where I do it,any repairs,pillar bedding rifle or just action bedding,to remove action from stock for any work like adjusting triggers,replace triggers.
A neighbor had a rough spot on his Savage bolt raceway and I was able to put it in the vise and lapp the raceway and got it smooth as a Savage can be.
I also use the vise to keep rifle still while checking headspace with go no go guages.
I have lapped many barrels on that rifle vise.
My neighbor borrows it to clean his rifle and his wife's rifle as well as both kids.
I have limited space unless I go to the garage which is pretty cold right now so a vise gives me a solid holding spot for my rifles.
When I was younger I worked Monday-Friday at me regular job and evenings and weekends I worked for a gunsmith and had a home made vise to hold rifles for many gunsmithing things.
I need one but many has never owned one.
Old Rooster