This is a bit tricky. But let me try to explain.
In the Core Rules, there are two types of Reserves: Strategic Reserves and Deep Strike. Strategic Reserves has a built in limit saying you cannot arrive earlier than round 2. But the Deep Strike rule has no such limits, so if playing with only the Core Rules, you can deep strike turn 1.
However, the Leviathan missions has further limitations. And since almost everyone plays with those missions all the time, you need to consider them.
"Reserves units cannot arrive during the first battle round and any Strategic Reserves or Reserves that have not arrived on the battlefield by the end of the third battle round count as having been destroyed, as are any units embarked within them (this does not apply to units that are placed into Strategic Reserves after the first battle round has started)."
Notice how this is all one long rule that does not apply to units placed into Strategic Reserves during the battle.
But, remember that Strategic Reserves have a built in limit to when you may deploy using those rules. The workaround for that is that a unit in Strategic Reserves where every model has the Deep Strike ability, they may deploy using the rules for Deep Strike. Which is not limited to turns.
The rules commentary explains it like this: "Deep Strike (and Strategic Reserves): If a unit with the Deep Strike ability arrives from Strategic Reserves, the controlling player can choose for that unit to be set up either using the rules for Strategic Reserves or using the Deep Strike ability. This also applies if a unit with the Deep Strike ability is placed into Strategic Reserves during the battle."
As for your second question. Shooting with a One Shot weapon does not remove or destroy that weapon. The model still has it. (which is great with Demo Charges, because they are assault weapons so the unit can Advance and still be "eligible to shoot", so they can do many missions after advancing)
So if a particular model is destroyed, and then Ressurected/returned to that unit (Cult Icon for example) then it will be the same model with the same weapon as it begun the battle with. And the game will remember if it is used or not.
But, Cult Ambush and the Astra Militarum stratagem Reinforcements!, those doesn't return destroyed models. They _replace_ the entire unit. That means instead of the acolyte André with the Demo Charge Deborah, we get the Acolyte Annie with the Demo Charge Duncan. And Annie has not yet shot with Duncan.
So André can never "reset" or reload his Demo Charge. Automatically Appended Next Post: Good luck tomorrow. I hope you see this before then.
And you should know that a lot of people think that One Shot weapons are destroyed/removed when used, despite the rule not saying anything like it, but instead clearly forbidding further shooting with them. Which implies they are still there. (it makes a lot of sense in the fiction that a Demo Charge is destroyed on use, but that is not the rule)
A few people are still confused over the whole "new unit" and how that means they are new models with new One Shot weapons.
So please talk through the above with the Tournament organiser or your opponent before playing.
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