Got nothing to lose at this point and a backup barrel. Give it a try and see if it helps. It should definitely last longer than 1000.
Have you checked your distance to lands yet and compare it to when you did your original load developement? Just to see how much the throat is worn?
Reason I ask is I just had a factory 22/250 barrel that opened up groups on me. Not 2moa but still 2x what it was. I scrubbed the crap out of it, especially the first 6-8” of the bore where the firecracking was, using a chamber rod and a 6.5cal brush. Afterwards rechecked my distance to lands and it was .030” farther than when I did my load development a couple years prior. That barrel has 1600 rounds on it.
So I seated my bullets out .030 farther and used same load. Just took it back to the range last week and shoot 2 groups in the .3’s and a 7 shot group in the 4’s… not sure how long it’ll last but it made it a lot better.