When I started shooting there was no internet, I probably knew several magnitudes less than you already know
7mm-08 is highly underrated I think. I can only guess people look at it alongside .308 and figure they're the same, but .308 is bigger so it must be better. .308 does have significant advantages, primarily in easy availability of ammunition and bullets.
If you are buying factory ammunition then 7mm-08 is likely to make a mess of a fox. But reduced loads work very well, although I'm not sure if I've taken a fox with the 7mm-08 as yet. I mainly use the .22LR and .204 for foxes. The 7mm-08 will punch a 100gn HP to about 3200fps which is very explosive on small game, but you can load the same bullet down to 1080fps and shoot it just like a very accurate .22LR for rabbits and foxes. It's like hitting a fox with three 40gn bullets simultaneously. But the bullet won't deform as such low speeds so you must place the bullet into the brain/cervical spine/heart for humane kills, the same as you would with a .22LR. As foxes will very often prop and watch you, such a shot is rarely difficult to make. There's really no reason to not mutilate foxes nowadays as there is no market for the fur anymore, and the foxes and crows will clean up the corpse quickly if it's torn up. Sometimes a too-neatly shot fox can lay in a paddock for several weeks before it gets noticed. Even with the .204 I still get an occasional skin to put in the freezer, despite the fox being totally eviscerated by the bullet. The .22LR is the better option though if you specifically want some pelts. I don't bother with scalps but they're worth $10 apiece here in Victoria.
I have a 7mm-08 which I consider my medium game rifle, but I'm yet to take any deer. I don't mind taking it out on an occasional fox patrol though. I wouldn't have any problem using it to hunt everything, using a variety of bullets and velocities to suit.
I subscribe via Email and Facebook to a lot of suppliers so I get messages about deals all the time. I buy bullets when they're cheap, even if I don't have anything to use them in at that time. I have well over 100kg of jacketed bullets on the (very strong) shelf. Brass might be as much as a buck a piece, but you can also make 7mm-08 out of very cheap once-fired .308 brass for under 20c apiece just by running it through your 7mm-08 sizing die and trimming it to length. If you don't run your loads at factory pressure levels the brass can last a very long time. Primers are about 8c apiece, or cheaper if you buy them in cartons of 5000. Powders are around $65 per 500gm bottle, but 4kg bottles at $375 are significantly cheaper. Bulk bullets might be under 40c apiece, better hunting or target bullets might be 70-90c apiece, but some high-level target bullets can be several dollars each. If you want to go really cheap then you can cast your own bullets as well. You'll get about 100 bullets out of a $10 kilogram of lead. Buying bulk components you can reload 7mm-08 for as little as 60c a shot. Casting your own bullets and using reduced loads of Trailboss powder you can easily halve that cost. But .22LR costs me about 11c a shot, cheaper than a lot of air-rifle pellets.