I only partly agree hblair. Check my page:
http://users.andara.com/~sconrad/ You can grab my current sight there SAW. I have improved my deflection shooting noticeably with this sight by moving the aim point up the glass for more visibility. You have to adjust your seat upwards to match, but it's no big deal. That extra visibility is great.
BTW, don't look at my gunnery percentage on the score page... it sucks.

I fly the Jug and the F6F a lot, and those planes have lots of ammo so I don't conserver it. I tend to lead the bogey by a lot extra and let him fly through the stream to get deflection hits. It wastes lots of bullets, but it gets the job done. I'll also pour bullets into a long range enemy in an attempt to damage him. In the Jug you have enough ammo to get away with that.

(BTW, long range for me is D 600 or so.)
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"