hamster

None of this prevents you from calling the first 300 km of a double century a 300K brevet. Unless there's something specific in the rules of the double that makes it incompatible with being a brevet.

Furnace Creek 508 (nor any part of it) is not a brevet by definition, because you're followed by your own SAG vehicle. With doubles, I generally don't see any conflict.

ThermionicScott 

Unless the ACP/RUSA/etc is willing to give you official credit, it's not a "brevet" (the word itself comes from the certificate you'd get.)

Homeyba

You used to see brevets run simultaneously with double centuries, usually a 400k where you add miles to a double. I haven't seen that done in a long time though. A really long time, like ten years or so. I think RUSA frowns on that. I don't know about other countries. For it to be an "official" brevet it has to be sanctioned by an organization. If you want to say you rode 300kms for the heck of it, that's still a 300k. Just not an official one.

unterhausen

I think it's safe to call a double a randonnée, but it doesn't make much sense to call it a brevet. As above, the "brevet" part comes from the card that you get stamped/signed along the way. Calling a ride a brevet is a little ignorant anyway, but I guess it has become part of the language of randonneuring.

rodar y rodar

Basic, I`m new at this game and don`t have a lot of wisdom to offer, but I`ve just gone through my first few brevets and the whole ramping up thing is still very fresh on my mind. Up until last fall, I`d finished several unofficial solo rides of 200k or more, so my first 200k brevet was relatively easy. I was disappointed to be the last finisher, and hurting a bit because I was in the middle of my annual cycling hybernation, but still not a big deal. The main problem I had was with navigation, and I worked that out before this year`s first "series" 200.

That series 200 was smooth as silk- didn`t really pay any attention to nutrition or hydration, the changes to my nav method worked out very well, I was in much better shape, and finished feeling just dandy. That left me only wanting to work on my off bike time and another tweek to my navigation system as goals for the 300.

The 300 was this past Saturday, and it really was a big leap for me. I started off pretty well, but things went wrong in the middle, and by sundown I was bonked and my morale went right out the window. My biggest issue I think was due to nutrition and hydration. I had to detour off route and find an open convenience store where I ate an orange and waited around for it to go to work while I pulled myself back together. I also think that trying to cut my off bike time so suddenly was a mistake- the old warning not to try anything on game day that you haven`t done first in practice. Bottom line, I`m still learning what I need to do, and FOR ME the step-by-step approach is warranted. I`ll have a new strategy to try out on the 400. Keeping the standard order might not be necessary for you, but if you can work out another 200 brevet or permanent before your 300, all that much better. Either way, good luck on your ride.

Machka 

The Furnace Creek 508 is not a brevet or a randonnee ... it's a different sort of long distance event.

A double century is not a brevet or a randonnee ... it's just 323 km done anyway you want.

A brevet or randonnee is a specific sanctioned event organised by/under the BRM or ACP with specific rules regarding controls, time limits, etc.