I would not be in a big hurry to scrap that A7 22-250 barrel. 1K is not enough to wash the throat of your barrel unless you have been shooting it fast enough to get it extremely hot a number of times.
I ran a 220 Swift up to 2600 rounds before accuracy started to drop off.
To answer your original question, though....Yes, an A7 can be rebarrelled.
Regards, Dave.