hi pete, first of all i'd like to wish you good luck, cause you'll need that. 700 mls is a big diffrence to 400, he may do it, he may not not, there's only one way to find out. myself i think he may struggle unless there's a helping wind. i'd go for out and out distance breeding for these types of races. but were you live is not far off the drag so he'll have company all the way probaly. i would breed off him before the season but only one youngster,and fly him on w/hood or roundabout. if your going to give tosses give him single up tosses. feed him on the floor with other birds so he's more calmer. i don't start my birds for the longer races until about 4/5 races in, jumpped into 200/250 mls then again the week after if all is well at around 300/350 the longer races are only a couple of weeks away now so just training until the big race.