This is an interesting idea, I only have about 6 32's that I would love to be able to fire 327 out of. Put me on the list to borrow a 327 reamer.
Because of the time the reamer spends in the mail, it will take too long for everyone to rent. So I've decided to request that people send cylinders to me. I'm all set up to ream them and I can do dozens in a day if the reamer is in my possession. Contribution is the same, shipping both ways plus $5 to help replace the reamer when it wears out. It's not a business and I'm not in it to make money, just help out my local friends and friends on the forum.
I've shot 100s of factory .327 FM rounds thru my three .32s since I reamed the cyls to .327 with no ill effect, there are no pressure signs on the primers and the cases usually fall from the chambers (it also didn't hurt that my new sharp reamer leaves a smoother surface in the chamber), but I want to make everyone aware of the pressures as Dougader noted above.
The .32 H&R Mag is rated at 21,000 cup and taking into account that Ruger designs for a 100% overbuild safety margin, the Ruger single six .32 cyl is good for at least 42,000 cup: the .327 Fed Mag is rated at 45,000 cup. Although I also handload the cartridge, I do not "hotrod" it or exceed factory pressures.
Of course in the .32 Mag/.32-20 convertible Blackhawk 'Buckeye' cylinders I ream to .327 Fed Mag, this is a non-issue.