The Mandolin by Sounds And Effects for Kontakt or Reason contains 1.05 gigs of samples and is suitable for any style of music.
The mandolin library / instrument includes the following articulations:
Picked - four velocity layers
Fingerstyle -Two different styles, five velocity layers each, round robin switches between the two styles and between finger style and picked (round robin is for Kontakt only)
Muted notes -Soft and hard
Strums -two speeds, hard and soft, also low octave strums
Tremelo -three speeds
Fret noises and chops - in each preset and mapped below the mandolins low range.
Presets allow for key switches from pretty much any articulation to another, for instance fingerstyle to picked notes, pick to pluck, mute to pick, picked to fast or slow strum, picked or fingerstyle to tremolo, and so on.
44 NNXT presets
1.06 gigs uncompressed / 433.5 megs ReFill packed
Reason 6 or higher.
Kontakt 5 or higher.
Audio Demos on the project pages and at Soundcloud.