I have a pair of S&W 64s that have throats measuring .355.
Also: several Rugers with similar dimensions.
Is there a place in North Texas that rents/sells reamers?
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I don't have Alzheimer's- My wife had me tested.

Do a search online or maybe on the Ruger forum. Seems like I've read there's an online place that rents what you're looking for.

You can take a short piece of 5/16" dowel , cut a 1" slit on one end . Get some 320 gr emery cloth from most any auto part store . Cut a piece and roll it onto the dowel , a snug fit into the cylinder throat . Chuck it into a 3/8's drill and slowly ream it larger . It takes time and patience but you can get a very accurate sizing done this way . I recently bought a nickel 19 that had the same problem , under size cylinder throats . When I finished , a 357 pin gauge slid into all 6 cylinder throats , a 358 would not . This is where I wanted to stop . It shoots very accurately -- now . Good Luck , Paul

Try 4D Reamer Rentals - Fred Zeglin at 406-752-2520 and the e-mail is The best chamber reamer rentals and gunsmithing tools from 4D rentals. They rent Chambering reamers, Dakota Bolt Handles and Extensive line of Custom Gunsmithing tools and parts. The reamers are first class and the price for renting is reasonable. Hope this helps.

Nick

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NRA Instructor\GCA Gunsmith

If you have a bunch of S&W and Rugers with .355 throats, you may want to check your measuring system. If just using calipers, it would be easy to be off a couple thou.

I was thinking along the same lines as Toolguy. I've got a bunch of S&W revolvers and a couple Rugers. None of them have throats that small.

If you decide to proceed I'd guess your best luck will either be a local gunsmith or ordering the parts online

Does a 9mm .355 bullet slide through with slight friction or drop through.

I too was thinking error in reading. For the same reason I recently purchased a plug gage to check against my calipers.
You can always take the cylinder to a local machine shop, they can accurately measure and verify your throats in question.
Karl

Trust me, guys, it's not my measuring system.
My two standard measurements are:
Quick 'n dirty- will a (Measured) .358" cast bullet push through and
My trusty pin gauges.
The revolvers with the tight throats are maybe 18% of my total 38/357 accumulation.
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I don't have Alzheimer's- My wife had me tested.

I don't know what is in your local area but Clymer and Manson seem to be the two leading brands to purchase.
Karl

As far as the potential issue of measuring may seem, in this case it doesn't really matter.
Go ahead and use a .358" reamer. It will only remove material if the throats are undersize. Doesn't matter if they're .355", .356" or even .357". Nothing would be removed if they were .358" or larger.
In fact, if you are casting your own bullets, it might be worth it to throat any .357" cylinders.

But, one caveat..... What are your bore dimensions?
It's best to avoid throating a cylinder to .358" if bore/groove diameter is less than .357", or perhaps .356" at the smallest.

Please post an update with your progress.

Best wishes for success!

Jim

Jim, I could've sworn that I mentioned that before, but no.
All bores mike out at .3570"/.3576".

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I don't have Alzheimer's- My wife had me tested.