Im on my last few jars of xbr 8208 - 308 shoots under 1/4moa. I had a 50.10(TR)/60.4(F) using that powder in NRAA nationals.I'm having some great results with both the 308 and the 22/250 using 8208. If you can get it in Britain, it's great powder. In the 22/250 I have a great load for a 62gn Sierra Game King which WILL stabilise in 1/14 twist. Muzzle velocities are a little over 3,400fps and I'm looking at using the rifle on Fallow Deer.
Cannot get in UK, unless the new Prime Minister rips up all the EU legislation. I wont hold my breath.