Only thing I would caution, be sure your poi doesn't change from day to day or hot barrel to cold barrel.
Sounds like you've got the precision, just make sure you've got the repeatability too. IMO it's the combination of both that make for LR accuracy.
FWIW; Just me, but I'd handload for anything beyond 400 yds. I've had much better luck over the years with handloads when it comes to factory rifles and best accuracy.
Congratulations and Best O Luck