longer barrels (than needed over optimal for a given cartridge): modest at best increase in velocity thus possible stability and at longer ranges and somewhat wider accuracy nodes. In the iron site competitions it made sense as you get the longer sight radius. Otherwise it added weight and at least in a hunting rifle you actually have to carry seemed to attract every branch, vine around. I have seen them work well, as yoou bushwack thru the heavy scrub before first light, at catching the huge spiderwebs rather than your face but not exactly the best way to be carrying them or use for them, but damned if I have not seen it done LOL.