Velocities w Lubed, Gas Checked Bullet

[Potashminer]

Back in the 60's my old man used a devise to test bullet concentricity. It was plain simple, a glass mirror about 18 inches long. He would level the mirror side to side and raise one end to create a rolling slope to the long end. He had a straight center line etched into the glass. he would start every slug he purchased at that time centered on that line and let it roll to the bottom. If a bullet deviated from center at the bottom of the roll, that bullet went into the "practice pile" if it rolled straight it went into the "gopher shooting & hunting pile.

That was back when manufacturing methods weren't up to todays standards and I can remember lots of bullets rolling off-center...the other thing I remember is that he almost eliminated "group fliers" from his hunting pile so that simple tool must have had merit.

Had read of that technique to sort home-made lead shot - to get ones that were more round than not - but that is first time I had read of doing that with bullets. As you write - sometimes is merit to simple things.