I am building a campground. Need to know how to figure wire size and voltage drop per foot

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Wire size. I am building a n RV park. I need to know how to figure wire size. The first camper will be 200 ft from meter center. There will be 16 campers. The main feed from the meter center will come in at the middle of the row of campers.It will run 260 ft. one way and 300 ft. the other way.All sites will have 50 amp service

I think you need to work out a better system. 200 feet is too long and 300 feet is too long. What you talking about is four 200 A services which is about 4 houses worth.

You really should have this professionally looked at with the possibility of placing load centers (expensive ones) near the point of use with a higher voltage feed. Possibly greater than 460 V.

If your worried about remote activation, you could use a RCCB or a Remote Controlled Circuit Breaker, similar, but not the same as these: http://www.flamecorp.com/ETA_PDF/ETA,4930.pdf

Sub-metering can be handled as well.

Also check out Midwest Electric Products, Inc. (http://www.midwestelectric.com) for RV pedistals.

It's a real ambitious project and it won't come cheap.

It's beyound DIY.

Wiring to the pedistal from a local panel really isn't a problem, but you need a local panel, preferably centrally located.

You need a much higher supply voltage and a transformer with some sort of switch gear designed for 50A breaker. That's 16*240 V * 50/100 (kVA) service. Or about 192 kVA.
This is about 800 amps.

It's not going to happen at a low voltage and at that distance.

If three phase is available, that could be considered as well.

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