"...ended up chucking the whole batch of 100..." You could have pulled 'em and started over.
"...measured powder more accurately, checked casings..." That's the fix. Squibs are usually about not enough powder. Very rarely are primers 'bad'. And oil doesn't guarantee their death. Water does nothing at all.
A primer alone will send a bullet, even a crimped bullet(no crimps on match grade ammo), into the barrel. That's not a big deal unless you didn't catch the odd sound and check the barrel before firing another shot. Doing that will cause a bulge in the barrel. Only fix is a new barrel.
A loosely seated bullet is not a squib in the making.
"...loading on a single-stage press..." The type of press makes no difference. Loading on a single-stage press is about technique. Visually checking the cases for powder is one such technique.
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