My Dad brought a large handful of these home from a match (possibly Camp Perry) in the early '60s and tried a few light loads with them. I always thought it was a SAECO bullet but am not too sure any more. The last 25 or so went through a NM Garand with 20-something or a low 30-something charge of Ball-C that I cooked up and they shot 1.5 MOA with my meager skills and iron sights.
The meplat was maybe .07-09 inch and I remember the included angle of the nose to be a little less than 90 degrees and nowhere close to 45 degrees. This was a few years before we got the chronograph but our educated guess was the load was going maybe 2200 fps.
They cut really clean holes in the paper, even with a load of Unique we figgured was lobbing them out at 1600 fps.
Wondering if anyone ever saw something like that and who really made it.