I've never used it in RIS, but I've read a thread or two here about using it for that. My reason for not using it in a big beer has always been the low attenuation/high flocculation tendencies, so no experience there. But I'm sure that with a big starter, plenty of O2, ramping up at the end, and rousing (if necessary) you'd get there, as evidenced by testimonials here. I just never wanted to spend the coin on that grain bill and get stuck high at the end (or have to work that hard, to be honest
![Wink ;)](http://www.homebrewersassociation.org/forum/Smileys/default/wink.gif)
). I would normally recommend highly using WY1450 (Denny style) for this, though it doesn't solve the 1968 issue. So, maybe a 1.070-ish Imperial ESB, dry hopped heavily, plenty of gypsum ? I also like the idea of a bigger, hoppier Old Peculier, ~ 1.070 - sort of a more British-y Arrogant Bastard. No coincidence - 1.070 is the top OG I've used 1968 at. Guess I'm not as much help as I intended !