us navy test fires electromagnetic cannon, page-5

After watching it on youtube it reminds me of the early days of MST's big bertha. to me it is a bench test type shown, proving the tech in priciple, very big very cumbersome, looks to be using a lot of electrical power as has been noted before it would take something the size of a ship to operate currently....however given time this to may be overcome, doubt it to be much of a threat to MST tech at the moment.
Cheers,
mrdog.