Back in the San Dimas days I believe Star was catered to the bulls eye shooters and they looked for anything that could effect accuracy. I gave up on the bullet nose up strategy real early. I plugged up all my top punch cavities with bedding compound. I was an IPSC shooter back in the late 70s w/ .45 200 gr. swc or 180 swc. Now I only compete in steel plate matches. Never needed to test the feathering theory for accuracy.
I think the take over may have been a little later then 1980