If all you have is the 308, then take it. Also remember, just cause you can load it up hot doesn't mean you need to or should do so! It's amazing how much recoil and barrel heat is reduced when you turn down the loads - which will be more important on a full PD day than any ballistic advantage you'd get from another 400fps. 110 VMax are a good choice but Hornady also makes a 110gn plain spire point that is a bit cheaper. You can also often find bulk round nose FMJ, typically intended for 30 Carbines, for cheap.
I would probably go pick up a 22LR of some type. Once you get a load figured and a pile of ammo prepped for your 308, you'll probably spend close to what a basic 22LR rifle and a brick of ammo would cost.
EDIT: I haven't been into a gunstore for a while, but a quick look online at Sportsman's Warehouse makes me think perhaps picking up a 22 and a brick of ammo may be kind of difficult right now!
I would probably go pick up a 22LR of some type. Once you get a load figured and a pile of ammo prepped for your 308, you'll probably spend close to what a basic 22LR rifle and a brick of ammo would cost.
EDIT: I haven't been into a gunstore for a while, but a quick look online at Sportsman's Warehouse makes me think perhaps picking up a 22 and a brick of ammo may be kind of difficult right now!