Alright, I went ahead and did a bit of number crunching using the dimensions found here:

http://www.harvel.com/pipepvc-sch40-80-dim.asp

Here are the results that I got, let me know if anything looks off.

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Barrel

3' of sch40 1/2" = 38.814553164293045
3.5' = 45 ...

Alright, thanks, I'll look into a 10 gallon.

Any suggestions from anyone on how long to make my 2" pvc chamber? The barrel will be either 1/2" or 3/4" (maybe both), about 3-4ft long.

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if you have access to a compressor, go with the foot long chamber.

Well I have a large, stationary ...

Probably a compressor if I am near electricity, if not I might buy one of those 5 gallon compressor tanks for like $30. It would be cool if I could use some sort of pump to fill the compressor tank if it runs out, but I don't know if/how that'd work.

Thanks to both responses! The fact that you both mostly agrees helps a lot with my decisions.

As for the tank, looks like I'll be going with 2", now I just need to determine a length, somewhere probably between 6 and 12". I want enough volume for maximum performance, but I don't want it to take ...

I'd like to start off with saying hello to everyone! I've finally decided to pursue my dream of building a pneumatic rifle, and throughout my many hours of research, I've probably spent a good 10-12 hours lurking around spudfiles in the last day or so. I am still shocked at the gold mine of ...