Top speed for the 410 was around 390. Some sources suggest with the belly 50kg shackles removed its "clean" speed was 395, some others suggest 388 (possibly slowed from the shackles?). Splitting the difference I'll round it to 390-ish. This would be a WEP setting, though I don't know if it was a 5-or-10-minute power setting or a 30-minute power setting. I don't know as much about the RPM and ata settings to recognize what is what we would call in AH a "WEP" setting.
Keep in mind the 410 had over 1000 km range of operations. Like our in-game Mossie, you wouldn't be flying it "topped off" in most situations. More times than not you'd be taking off with 25% I wager.