50y sub .3 if mag fed, sub .2 if single loaded.
100y and 200y, I don’t really have enough experience with non-factory rifles to speak definitely. My Anschutz barreled Sako has fired numerous .5 groups @ 100m, so I can only guess a factory Anschutz would perform that well or better. Drawing on that, I’d expect a bit better from a custom build. I haven’t done a lot of testing at 200, preferring to play at 300-400(shooting to the limits of the range I have access to

), but have a 40XB that didn’t seem to have issues holding 1” at 200 with a bunch of us watching my friend driving it. Again, that’s perhaps an exceptional factory gun, I dunno, it came from the CMP. You already know my Bergara had no issues shooting sub 3” groups at 300y, and at least one fellow who didn’t believe it possible later posted his own groups far tighter from a custom Rim-X, so there’s that. Attitude affects how we shoot, and not everyone has a test bed to eliminate human input, thus we have good days and bad. I think if you believe something isn’t possible, you may not see the best results.
I believe ammo today isn’t what it was even 20 years ago, but I believe rifles are far better. If the ammo can catch back up, maybe the grand days of exceptional mid grade fodder will get more of us out there tripping triggers!