As Bob says it can depend on the barrel you have, the JSB 33.95 KO's worked very well, I also had the chance to try some H&N 6.36 and they were amazing, I am not sure though if there are any plans to release them commercially as Daystate went with JSB, as they seem to be not very barrel fussy, they are availible now at the UK Daystate factory so perhaps AOA has them on order?
Maybe the HOWLERS in .25 will be released in the near future, the feedback from the .22 HOWLERS seems exceptional as I think they are made to suit the Daystate LW barrels, Roger (Laity) has tried them but I haven't had the chance yet.