I have offered this service on the forum before but wanted to again extend the olive branch to any interested parties. My friend Gerald and I operate our own proof house behind his shed in Anna, IL. Costs are nominal, only one case of beer or cash to purchase said case.
The proof house operates like this:
Upon recieving the firearm in question and said case of beer we tie it to an old tire behind Gerald's shed (the gun, not the beer) with a long piece of bailing twine attached to the triggers which we've blocked with a chunk of kindling so they'll both fire at the same time.
The case of beer is iced down in a galvanized metal washtub around the front side of the shed. We use galvanized for safety as the cheap bastards that send us guns for testing usually send very cheap beer that would quickly eat through ungalvanized metal pretty quick.
After we have the first couple beers we load up in my pickup truck and head for the sporting goods store. We look through their stock and find the longest hottest loads available in the particular gauge that we have been asked to test. One of us then procedes to get the clerks attention while the other sticks the box of shells in the pocket of his coat and runs out of the store. Gerald is skinny and runs faster than I do so I usually draw the clerks attention as my wide frame provides a good shield as Gerald attempts to stash said box of shells. I know this may seem underhanded but with the kind of proofing service we provide we've got to cut corners where we can, we don't charge any money just a case of beer as previously stated.
Upon returning to Gerald's shed we then have another beer or so and proceed with the proofing process. We load said firearm with the "proof loads" and begin testing. We fire off two shells at a time through the gun to create more stress on the firearm. Stepping around the corner of the shed and using the bailing twine to pull the triggers of course. The stepping around the corner motion is to protect ourselves from any stray flying hunks of metal that may come off the test subject in the proofing process.
We continue testing until we run of of shells or beer, whichever comes first. Occasionally the firearm owner sends a jug of moonshine instead of the requested case of beer. This usually slows the proofing process considerably due to bouts of blindness and hallucination brought on by the white lightening. So remember, if you send that good ol' mountain dew expect the testing process to take a few extra days.
We offer two kinds of proofing. The first is what's called service pressure which is essentially just a proof using shells that are a bit over what you intend to fire through the gun. The second is called magnum proof and entails stuffing rags into the muzzles to create more pressure and a heavier proof. Please let us know which type of proof you are looking for in advance as Gerald has to steal the rags out of his Mama's sewing basket.
If, upon the completion of the tests, the gun is found to be still in once piece we advise the owner to send another case of beer and cash for return postage. If the gun blows up into 40 jillion pieces as does happen occasionally we retain all usable parts and they are sold off on eBay to pay for another case of beer and you don't owe us anything.
Feel free to send us any firearms you wanted tested in this highly successful and scientific manner. Our beer of preference is Pabst Blue Ribbon but we was raised right and will drink anything anybody gives us.