Convergence confusion, please help.

[MadTommy]

Yes this subject again, I have just read numerous threads about gun convergence, and i am only more confused than before.

Please help me with a few things.

Firstly:
Horizontal & vertical convergence bug:
Are they switched in the now official Steam patch? i.e does horizontal convergence setting actually influence vertical convergence and visa versa?
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Secondary:
I also read:

It seems there is a small error in CoD regarding the gunsights. Instead of measuring the wingspan from horizontal line to horizontal line, as they did in real life, the CoD sights measure the distance from the central dot to the horizontal line.

This means that you have to double the setting on the range dial.

So, if you set your convergence (in the settings screen, before entering the mission) to, say, 150 yards, then you have to set the range dial to 300

Is this correct?
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Fourthly:
How do i workout how to set vertical convergence? I assume this is relative to bullet drop, why would you want to have this different from horizontal convergence? I've read mention of 'cone of fire', but surely this is just the same as being out of convergence?

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What range do you use online?

I tend to use 250yds as a Spit/Hurricane pilot.. but i picked this number out of thin air!

Thanks for any help!