End of the year, 2019, last bit of range time at 200 yards.
Pulled the BBBmag test platform off the shelf and reassembled it.
And the first 5 shots at 200 yards produced a random act of accuracy.

Sub-moa...should have stopped right there.
That way I could say "all day long".
Browning 25 grain 17wsm rated 2600 fps.
It's relabeled Winchester production.
Same box, different tip color, Winchester date code on the end flap.
Quick inspection showed broken off ballistic tips, uneven seating depths,
tilted bullets, differing brass dimensions...that's that minimal Winchester quality control.
200 fps ES and the cartridge defects created some spread.
Second box showed more visible defects.
Tips bent or misshapen and uneven bullet seating.
ES was better, only 100 fps, half that of the first box.
1 failure to fire. 4 retries and no joy.
All deep clean strikes, no primer in the rim.