OK, looking at your powder charge and comparing it to Hodgdon's own data, I'd say you're charge weight is good. So I don't think it's a light load causing the bolt to cycle slowly or not far enough.
When you say fail to eject can you narrow that down a bit?
Is the casing jamming in the ejection port ? Or is it riding with the bolt head and returning to the chamber? Is the extractor pulling the empty casing out of the chamber ?
The first place I would look is the bolt head and make sure that both the ejector (which forces the empty casing to rotate around the extractor and throws the casing clear of the gun) and the extractor (which engages the cartridge case rim and pulls the casings from the chamber) are functioning.
If that brass is really only once fired, it should be fine. However, one of the common problems with LE ammunition is sometimes a particular casing gets cycled in and out of a chamber repeatedly without ever being fired. The operator clears the action and returns that particular cartridge to the top of the magazine. Those repeated cycles can chew up the cartridge rim on that one cartridge and that cause functioning problems.
Operators are frequently instructed to replace that top cartridge with a new cartridge to avoid that repeated damage to that cartridge rim.
You might have several casings from your SWAT buddies that got cycled through actions repeatedly before being fired.