Cylinder Throat Questions

[twbryan]

Have been reading a great deal on the issue with Rugers having undersized cylinder throats. Today I took a .358 sized bullet and checked my Ruger GP100. The bullet could not be pushed into (much less through) any of the cylinder throats. I did find it would start into the breech end of the barrel nicely. I am thinking this means I should acquire a .358 reamer and run it through these throats. I question whether I need a reamer with a pilot bushing? If the cylinder is secured,and the reamer is lowered into the throat by way of a drill press,and turned by hand,then I should be able to do the job with a standard reamer?

[nobearsyet]

They make something called a throating reamer, and that's what I'd use if I were you, I don't have one, but there's a post somewhere on this board about someone opening up there throats

[twbryan]

nobearsyet- I have looked at the one's from brownell's ,but they are quite expensive.

[nobearsyet]

Might be better off to farm that job out then, at least if you're only going to do one gun, after a couple it might pay for itself, kind of like my set of pin gauges

[twbryan]

I think I have four revolvers to be reamed out. It would be better to get the tool,the only question is in which do I need?

[Mark Terry]

My advice would be to call Manson directly.

www.mansonreamers.com/

www.mansonreamers.com/contact%20us.html

Brownell's no longer carries the size you'll need.

[twbryan]

Would it be possible to use a crocus cloth hone to expand the throat area? The smallest throat measured is .356.

[Mark Terry]

Despite any measurements, how does the gun shoot? Is there a specific problem? If it shoots okay, don't do anything. My experience is that most guns (and all of mine) will shoot better than I can shoot them, so my time is better spent refining me, not the gun.

I have ocassionally run into guns that try as I might, won't shoot reasonable groups at 25 yards.

There are some who've done throating with abrasive paper / cloth and there are websites with instructions for this technique. It may work, I don't know.

One school of thought says it's possible that throats may not be concentric and the abrasive cloth may make an egg shaped throat larger but still egg shaped. Reaming gives you a better chance to be sure they are round and the proper diameter. I reamed mine.

I am not a gunsmith or machinist and I don't have a lot of experience in this area. There are others here (and elsewhere) who are far better qualified to give you advice.

You may want to learn about forcing cone reaming. Hopefully, you won't have to learn about Taylor Throating.

Still, shoot it and shoot it some more. Don't do anything until you are convinced it has a problem.

[J Miller]

You might contact the Cylinder smith at: www.cylindersmith.com/ . Fixing throats is his specialty.

Joe

[twbryan]

The accuracy has been mediocre,so I started looking for reasons. Farming the work out would be nice,but I think it would be better to learn how to deal with it myself.

[nobearsyet]

I can appreciate that, might call manson and see if the tool comes with instructions

[twbryan]

So far I've determined that the size I need is letter size T (.358),I can get those for roughly $25. I have a drill press I can use to manually ream the cylinders.

[nobearsyet]

Is there away to use the reamer as a pull through going down the barrel perhaps? Just to keep everything aligned

[twbryan]

The barrel will (should be) a smaller diameter than the reamer, so no. Might do it using the chamber itself with the appropriate bushing. Ahh,had to correct that so it made sense,caffeine deprivation.

[nobearsyet]

I see