Except for the part where he was weighing each bullet before reloading each round. 😬
I don't remember that scene, so I don't recall where those were jacketed or cast bullets, but either way, one of my friends who shot BR competitively did that with his match bullets and I damned sure did it with my heavy cast bullets 'cause that was the only way to determine which had air pockets that might be off center affecting accuracy .. sometimes pretty badly. It is worth doing on the GBL / GSBL / guide guns ... I've never owned one that wasn't a sub MOA rifle.