I am not going to inspect 100 needles. The 20 or so I have used have been fine for the 301. I wouldn't put one in the Elna with her closer specs. I don't remember what I used in the Necchi when she had to stand in for the 301 FMQ. That's another machine with more exact specs. I think you have know your machines and I really don't mind saving money where I can. The only thing the 301 cares about is frequent oiling and keeping the lint out of the bobbin area.
Ken, the same machine, Miss Elna sewed my brother's thick flame retardant racing suit and a silk organza wedding dress. She's the one with the stories to tell. Sequined dance costumes and men's leather belts, etc!
I had to work on a friend's plastic wonder today and not say anything. I tested it sitting at the same spot I just sewn with my Singer 404 and wow! what a difference. The little Brother had the table jumping. I was surprised, but I was quiet.