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Not got the new marine codex or had a look at the chaos one yet.

Is there any precedent besides tournament/house rules to stop you simply swapping what <CHAPTER> or <LEGION> keyword you want to use per game?

The same applies to relics although not so gamey.

Like are you asking if you can do this mid game or something?

Play whatever Chapter rules you want. Your mandollies after all!

Mid game, Of course not.

Between games, explicitly permitted and encouraged.

 BaconCatBug wrote:
Mid game, Of course not.

Between games, explicitly permitted and encouraged.

Your <chapter>/<legion>/<flavour> should be noted with the unit on your army list.

It is something you set when the army list is created and can, therefore, be changed whenever you alter your army list.

It is not something you would choose after exchanging army lists or between rounds of tournaments with fixed lists (most of them).

 Scott-S6 wrote:

 BaconCatBug wrote:
Mid game, Of course not.

Between games, explicitly permitted and encouraged.

Your <chapter>/<legion>/<flavour> should be noted with the unit on your army list.

It is something you set when the army list is created and can, therefore, be changed whenever you alter your army list.

It is not something you would choose after exchanging army lists or between rounds of tournaments with fixed lists (most of them).

Thats my point, where in the rules does it explicitly say you note it on your army list? Unless you can argue in the army roster section of the rule book that a keyword is an 'upgrade'
What stops you going to a tourney and be ironwarriors in one game then world eaters in the next

 Latro_ wrote:

 Scott-S6 wrote:

 BaconCatBug wrote:
Mid game, Of course not.

Between games, explicitly permitted and encouraged.

Your <chapter>/<legion>/<flavour> should be noted with the unit on your army list.

It is something you set when the army list is created and can, therefore, be changed whenever you alter your army list.

It is not something you would choose after exchanging army lists or between rounds of tournaments with fixed lists (most of them).

Thats my point, where in the rules does it explicitly say you note it on your army list? Unless you can argue in the army roster section of the rule book that a keyword is an 'upgrade'
What stops you going to a tourney and be ironwarriors in one game then world eaters in the next

The TO can stop you, because that's the function of a TO.

Also the rule for <CHAPTER> states:

When you include such a unit in your army, you must nominate which Chapter that unit is from. You then simply replace the <CHAPTER> keyword in every instance on that unit’s datasheet with the name of your chosen Chapter

The only way it even remotely makes sense for "include such a unit in your army" to be interpreted is when you add it to an army roster.

You won't find the rule in the any official game rules, however most, if not all tournaments have a tournament rule that you use the same army for every match and that includes which chapter tactics you play with.

“when you include such a unit in your army you must nominate which chapter that unit is from".

That language is in the codexes and indexes.

We don't have an explicit declaration here on when the nominating happens but there is definitely an argument to be made, based on that statement, that it happens at the point where the unit is added to your roster.

Allowing the nominations to happen later causes a whole range of problems for example, it may not be possible to determine if an army list if valid until after those nominations are made.

If we do not take the above statement as specifying that nomination happens at time of unit selection then we have no guidance on when it happens. For example it would be permissible to wait until after game start to decide and only nominating the chapter for each unit at the point that it would make a difference. Does this seem to be acceptable?

https://www.warhammer-community.com/2017/08/07/warhammer-40000-grand-tournament-events-pack-now-available/

The Grand Tournament rules require all those choices be made at the list building stage and kept for the remainder of the event.

I think as long as you're allowed to change up your armylist, you can swap the Chapter or Legion keyword. This will all depend on the tournament in question and how they handle lists in-between (the TO could very well allow you to change out units but forbid keywords from changing).

As for casual games, there's nothing stopping your Blood Angels from feeling a little Ultramarine now and then. As long as you're upfront with your opponent and don't drop the ball mid-game.

 Latro_ wrote:

 Scott-S6 wrote:

 BaconCatBug wrote:
Mid game, Of course not.

Between games, explicitly permitted and encouraged.

Your <chapter>/<legion>/<flavour> should be noted with the unit on your army list.

It is something you set when the army list is created and can, therefore, be changed whenever you alter your army list.

It is not something you would choose after exchanging army lists or between rounds of tournaments with fixed lists (most of them).

Thats my point, where in the rules does it explicitly say you note it on your army list? Unless you can argue in the army roster section of the rule book that a keyword is an 'upgrade'
What stops you going to a tourney and be ironwarriors in one game then world eaters in the next

Not the rulebook because the rulebook doesn't have rules for tournament play. It basically assumes you play individual games, not a grand series. That's why it would be the tournament that would set rules for this since thay have to make up the rules for a tourney anyway.

This must be ruled by the tournament organizers. The book has absolutely no problem with a Tyranids army being Kraken at morning and Leviathan at night

There isn't a single tournament that would allow you to switch chapters mid day. It needs to be on your list.

 Latro_ wrote:
Not got the new marine codex or had a look at the chaos one yet.

Is there any precedent besides tournament/house rules to stop you simply swapping what <CHAPTER> or <LEGION> keyword you want to use per game?

The same applies to relics although not so gamey.

Each game is a different game. Unless you're playing in some setup where you're expected to keep the same list from game to game then no, there is nothing to stop you.