The 280 Halger was very similar to (probably based on, or basis for) the 280 Ross. It is a semi-rimmed case of 2.58" and a loaded length of 3.50". It can be formed by simply running 280 Ross brass into a 280 Halger die (but I wonder if the Ross die might work).

It was originally loaded to high for the day chamber pressure, and there were apparently three factory loads. The 180 grain load was "listed" at 3,000 fps, the 143 grain at 3,450 fps. and the 100 grain at 3,800 fps. These figures may have been inflated a bit, as the Ross (which was no shrinking violet in the pressure department itself) only developed 2,550 fps in factory loads for the 180 grain bullet.

It is interesting that you should ask about these particular calibers, as I am presently working with a 333 Jeffery, a 350 Rigby, and a 280 Ross, all in original factory sporters. Any of these would be as useable in present day hunting as they were when introduced. There are newer, faster cartridges in the same categories, but the new rounds do not have the nostalgia value, or really do much better job than these oldies.

Jim