'Is it posible that the mound existed before the rifle range?
I am still unsure why the mound has not been ploughed out as it isn't particularly big and is right in the middle of the field.'

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It's certainly poss that the mound existed before the rifle range. Barrows (round or otherwise) have been re-used many times, for such things as mounds for the base of windmills (why build another mound when one is already there?) and for other purposes (locally i'm thinking http://www.themodernantiquarian.com/site/4625/lord_wantage_monument_barrow.html - which was built on top of an existing barrow).

I wouldn't rule it out, but until such evidence exists to prove it either way, then it's in limbo.

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I suppose if something has been there a while, then most farmers would just plough around it (gradually eroded the edges). It would be a fair bit of effort to get rid of it, and the Archers or Country File might be a more attractive alternative! :-)

WFx