|Rio's Short Outbound are 30 foot heads that are three line sizes above the AFTM line recommendations for rods. |
Standard formulation for shooting heads is 30 feet or so of head 2 line weights above your rod. Peninsula Fly Fishers provided this helpful table on the line weight in grains as follows:
So for your 8 weight you would go with the ten weight, 280 grains. Rio's Outbound Short for 8 weight is listed as 315 grains. Rio's Outbound Short for 7 weight is 265 grains.
Why does RIO do this and do people who use these heads find them useful? I don't see the benefit of overlining when it comes to shooting heads at all. I get overlining one weight with a full line, but this nearly triple over-lining to me seems to really be unneccesary.