$250 isn't bad.
1) what's the purpose for the rifle?
2) if you had the intent of refurbish, is it a WW2 Australian Rifle, or an OG WW1 British one?
3) is it all matching?
Shooting the rifle will tell you a lot. Don't be overly concerned with accuracy, the draws may be cracked, worn, or shrunk; much of the accuracy comes from a solid stock mounting. Key holing is bad, but understand most off shelf .303 Br will be undersized. Couple that with a worn bore...you'll get key holes. While the bolt heads are easily changeable, if all parts are matching, the likelihood someone has improperly changed out the head is reduced. Fired brass will indicate headspace issues. Save your $100 smith inspection.
If you're going to shoot it more often than a couple of dozen times, get into reloading. at $4 or $5 a round for undersized cartridges (bullet), tailormade makes a lot of sense.