06-09-2012, 10:13 AM
Barrel length will affect velocity, but not necessarily accuracy. Actually, shorter barrels can be stiffer, resulting in better accuracy. But no doubt longer heavier weapons tend to be more forgiving and easier to shoot, though not friendly to carry much in the field. I've shot 18" to 20" Grendel barrels quite a bit at 600 yards, and it's not a problem for either. I still think 19.5" will be the best choice for your application.
Drifter