Yeah, AcraGlas can sometimes make a big difference.
But, to be honest, it likely won't fix that eroded throat.
The best plan I can think of is to get started in reloading...it's only slightly more than $100 for a Lee single-stage press with the scale, ect. and dies for one caliber.
The powder, primers and slugs will set you back another $30 or so.
Then you can experiment with bullet seating depth, and you may find that a longer load, .01" or .015 from the lands, will give you excellent groups.
You can't be sure if this rifle ever shot well, though. Did you check the fired cases for runout? That'll tell you if the chamber is centered on the bore properly.
Then again, if you have no plans for ever reloading, you will be best served by having a good smith rebarrel it for you.
If you glass-bed your rifle now, the new barrel will likely not be of the proper profile to fit properly anymore, making for a lot of work augering out the barrel channel before glassing in the new barrel.
Good luck!