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When firing an ordnance weapon it forces all other weapons to be fired as snapshots.

....Could you not just elect to fire the ordnance weapon last? "ok fired off all my secondaries, now I'm gonna fire the big gun and snapshoot from now on. BANG. Shooting done."
Is there something preventing you from doing this, or is it just a move?

Ideally, all weapons on a vehicle shoot at the same time. They're just resolved in order, as it'd be confusing to roll for all the weapons at the same time. Thus, if you shoot full BS with the non-ordnance weapons, you can't fire the ordnance one, as shooting with an ordnance forces you to snapshot the other weapons.

You're not allowed to,break rules. By not firing as snapshots you've broken the ordnance rule.

 hippyjr wrote:
....Could you not just elect to fire the ordnance weapon last? "ok fired off all my secondaries, now I'm gonna fire the big gun and snapshoot from now on. BANG. Shooting done."

If you fire an ordnance weapon, your other weapons can only make snap shots.
It doesn't say "if you fire a ordnance weapon, your other weapons can only make snap shots from that point onwards".

Let's say I have £20. Item A costs £20, Item B costs £10, and Item C costs £5.
Buying Item A prevents me from buying Items B or C.
Could I get around this restriction by buying Items B and C first, and then buying Item A?

 hippyjr wrote:
When firing an ordnance weapon it forces all other weapons to be fired as snapshots.

....Could you not just elect to fire the ordnance weapon last? "ok fired off all my secondaries, now I'm gonna fire the big gun and snapshoot from now on. BANG. Shooting done."
Is there something preventing you from doing this, or is it just a move?

Literally speaking, there is nothing preventing the timing.

However, it is a move to try because all of your other shots that turn.are to be Snap Shots. I would either start putting casualties back so you can try again, or packing up.

Hmmn.... here's how I see it:

-In Warhammer 40k, the shooting phase consists of rolling to hit, then to wound, then your opponent makes saves.

-All weapons are treated as having fired simultaneously, as indicated by the generation of a wound pool. otherwise, heavy and special weapons could be fired after the standard weapons in the unit.

for example:
Player A has a squad of cultists, and a Chaos Lord in terminator armour. Player B has a Tactical squad, Sgt with combi-melta.
by your logic of choosing the order in which your weapons fire, the tactical squad could open up with the bolters and murder all the cultists, then the sgt could fire the combi to try and ID player B's warlord, due to the lack of ablative wounds...

besides, the unit declares an attack, which is then resolved. the option to elect an order in which they are fired is never given...

I'm also 99.9999% sure it's a case of wording on the ordnance rule, pretty sure it's that "In the shooting phase in which a vehicle fires an ordnance weapon, all other weapons must fire as snapshots." IE, by firing the heavy bolters in your example first, you are disqualifying yourself from being allowed the fire the big gun....

either way, If you tried that against me I'd either be standing mini's back up and demanding you re-fired as snapshots, refusing to then let you fire your ordnance weapon if you wouldn't, or just packing up and leaving. Charistoph has the right idea here...

...2nded on the D***move though...

Just my thoughts on the matter....

Weapons are NOT fired simultaneously in 7th edition. This is explicit.

nosferatu1001 wrote:
Weapons are NOT fired simultaneously in 7th edition. This is explicit.

Correct. Weapons withe same name are considered fired simultaneously, but between different Weapon Names, they no longer are treated as simultaneous.

Just to be clear - I had no intention of doing this, I fully understand that it is a thing to do.
There's just something I find enjoyable at poking holes in GWs crappy rule writing

If you fired a non-ordinance weapon not in snap shots, you will be unable to fire the ordinance weapon, as doing so would violate the rules.

Ordnance

 hippyjr wrote:
When firing an ordnance weapon it forces all other weapons to be fired as snapshots.

....Could you not just elect to fire the ordnance weapon last? "ok fired off all my secondaries, now I'm gonna fire the big gun and snapshoot from now on. BANG. Shooting done."
Is there something preventing you from doing this, or is it just a move?

If you fired other weapons at normal BS then fire Ordnance, have you fired all other weapons as Snap Shots like the rule tells you to do? No you haven't so you would be breaking the rules.