Bomar - I assume that your box top is blue with a yellow border, a red stripe containing the Peters “Circle P” trademark and 'HIGH VELOCITY" followed by the “Oval Dupont” trademark, and with white print.
Note that the bullet weight is 173 grains. Take any standard factory hardball round of 230 grain bullet weight and weigh the two rounds against each other. You should get a 50+ grain weight difference.
Further, the ogive of the 173 grain Highway Patrol bullet is much more pointed than that of a normal 230 grain hardball projectile.
These were made primarily for police use, but to my knowledge, the sales were not restricted to police. There are similar loads from other makers - Remington of course, and as I recall, Winchester.
If anyone wants, I can post a picture of the Peters box that I described - I assume it isthe box in question - and perhaps others for the same basic loading. I cannot post any cartridge picture, as I have none of these rounds anymore. Like everything else, simple possession is prohibited in California.
These would penetrate vehicle glass and vehicle body metal, but not armor. Peters called it right in avoiding the often meaningless term “armor piercing” and calling this stuff “metal penetrating.” I think simply the velocity, the ogive, and perhaps a thicker bullet jacket at the nose was the only thing that made it penetrate better. There was not penetrator core like in modern AP and MP loads.