Hmmm, just off hand, I'd say they'd work great on those. But I'd check the grains per inch on the 340 and 400 first. If it was over 8 or so they might not be quite big enough. BUT understand I am just guessing, maybe someone else can give you some more definative advice. I'd check the Easton website and calculate your estimated arrow weight and go from there. Blazer might have some rule of thumb weights on the site too. Be worth checking.