Approximately 6 meters compared to 40mm casualty radius: 427 ft (130 m) and
kill radius: 16 ft (5 m). XM25 is greater since it is air-burst rated (the M397 and M397A1 are still rated same as point detonating even though rebounding type).
A random thought on the video posted by Desktop commando - did anyone else notice the "bad guy" in the airburst explanatory diagram at 45 seconds is holding an SA80... The new Taliban weapon of choice, or a spot of subliminal messaging in case we pesky Brits try to put down the 229 year rebellion?
On a more serious note, 1 weapon failure & 1 ammunition failure at the same time doesn't look good, but unless they've been keeping quiet about a series of other mishaps I wouldn't say the program is dead yet, after all it could be a very handy weapon in certain circumstances, especially if once proven the technology can be transferred. Intelligent airburst GMG anyone? Now that's how to make a beaten zone!
The XM25, however, will continue through its "Engineering, Manufacture & Development" phase where the system will be further refined and improved, Army officials say. It's unclear how this latest mishap will affect program officials' plans to begin fielding the XM25 in the fall of 2014.