Distributor Pickup test

I just had a pickup fail on my 340 a couple weeks ago. I ohmed out several good used ones and they were in the 280 Ω range if I remember correctly. You can test everything by pulling the distributor and spinning it by hand. Remove the coil wire from the cap and put it close to ground. You can also momentarily short the two distributor plug wires on the harness side to trigger the ignition box.
First thing is make sure your gap is set right on the pickup.
I should note that the failed pickup did Ω out correctly but was in fact bad.