You got a screaming deal, most of the 788s I see around are selling for $350-$450. 788s are fantastically accurate (if they are in good shape), but will not tolerate hot loads very well. Also, the trigger mechanism is rather delicate being as the housing is cast aluminum and it has a lot of plastic parts. I would recommend you get a new trigger right up front and swap it out before the factory trigger breaks, just put the original in a box somewhere where you can find it if you ever try to sell the rifle.
Never try to educate someone who resists knowledge at all costs.
But what do I know?