DW is the way to go & the 14" is perfect. Last paint I shot was 677 (currently my smallest insert). My 4 outings this year, the paint was 677 2x's and very large 689+ the other 2 times.
IMHO, the J&J bores are not the sizes you are most likely to need (.682, 685, .688, .691, .693).
I would also recommend a CCM barrel kit.
GoG has 675 & 677 (alum inserts are approx $10 each).
The DW barrel is really nice, points well, very light and still tough.
Originally posted by heinous: "sniper's gun always gets extra camera love"