These four loads all have the same characteristics. They are original loads from the four manufacturers with the correct bullets, primers and primer seals. All have had a small hole drilled through the side of the case and into the bullet just below the case mouth. I suspect this is an alignment hole where a pin is inserted to ensure the pressure test holes are properly alighed with the test ports. Each round had two test holes, one on the opposite the alighment hole and a smaller test hold 90 degrees to the right of the large test hold. The cartridge on the right illustrates the small test hole. Note that they all have a scored line on the case head for rough alighment.
This appears to be a group of specimens made by a lab to test commercial ammunition from four manufacturers. I have quite a number of pressure test cartridges, but these are the only ones with TWO test holes and which use an alignment hole near the case mouth. I hope these distinctive characteristics will allow someone to identify the lab or at least the country where these rounds were modified for pressure testing.