On 31 May 2016, at 22:59, Richard Aiken <xxxxxx@gmail.com> wrote:

How are they more than doubling the range, when fired from powder guns?? Do they mean effective (e.g. accurate) range?

https://en.m.wikipedia.org/wiki/M982_Excalibur

The round extends fins and glides to the target for the extra range.

Phil Kitching