S&W Recut My Forcing Cone??

[DirtyHairy]

Hi folks,

I sent in my (replacement) 460 for a timing issue. Photo below shows the cylinder not aligning with the barrel. Today I got notified it's on its way home so I called to see what they did to it, replaced cylinder, some timing components, but they also recut the forcing cone...???

This makes me a little nervous because the entire point of this gun is to hunt where you need to use a straight walled cartridge so long range accuracy is a huge factor to me. Has anyone else had this done to their gun as a repair as opposed to an improvement?




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[Green Frog]

I'm not how you shot that picture, but it looks like there is a curve in the bore(???) When your 460 gets back, I would make up a close fitting range rod and check barrel to cylinder alignment carefully as well as checking bore straightness by whatever means available (too complex to describe here.)

Froggie

 

[DirtyHairy]

I'm not how you shot that picture, but it looks like there is a curve in the bore(???) When your 460 gets back, I would make up a close fitting range rod and check barrel to cylinder alignment carefully as well as checking bore straightness by whatever means available (too complex to describe here.)

Froggie

No curve in the bore. If you look closely at the end of the bore, you can see the cylinder chamber not aligned with the barrel. There is a moon sliver shape on the right side.


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[dusty3030]

Don't know, wasn't there at the factory, but -
Re-cutting the forcing cone I would think be a good thing with this repair.

The 460 has a two piece barrel. When they fit the new cylinder they had to re set the barrel gap. I'm sure they squared off the barrel face and re-cut the forcing cone, set the gap, then tightened the barrel nut to lock in. This is a good thing, I wouldn't let that concern me.

 

[NCBeagle]

Bought one of the "new" 2.75" Models 66 a couple years ago. Shaved lead so bad that the first range trip left my face bloody. Think that I did a post about it. Had a local shop recut the forcing cone...all good after that fix.

 

[Protocall_Design]

Most usually the muzzle crown and forcing cone needs to be recut from the factory anyway if you want match grade accuracy. The rifling is almost always very good, but the ends are almost always off, from a little to a lot. Every gun is different.

 

[DirtyHairy]

S&W Recut My Forcing Cone??

Don't know, wasn't there at the factory, but -
Re-cutting the forcing cone I would think be a good thing with this repair.

The 460 has a two piece barrel. When they fit the new cylinder they had to re set the barrel gap. I'm sure they squared off the barrel face and re-cut the forcing cone, set the gap, then tightened the barrel nut to lock in. This is a good thing, I wouldn't let that concern me.

This is a good point. The only reason I am concerned is I've had experiences with sending something in for repair and it returns with the original problem fixed and new problems it never had before.

Also, I have the 7.5" model which I believe is not a two piece barrel...

Is there a way to tell if they just machined the face of the forcing cone or if they actually made the forcing cone larger?


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[DirtyHairy]

Most usually the muzzle crown and forcing cone needs to be recut from the factory anyway if you want match grade accuracy. The rifling is almost always very good, but the ends are almost always off, from a little to a lot. Every gun is different.

Emphasis on the "almost" in "rifling is almost always very good"




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[steelslaver]

Several reasons this could have happened when new cylinder was fit. Maybe the rear of barrel was slightly out of square. Possibly the forcing cone wasn't smooth enough. I wouldn't worry about it until I had it to the range.

 

[Protocall_Design]

Emphasis on the "almost" in "rifling is almost always very good"
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I said almost because I have seen a handful (less than 10) of barrels over 40 years that the rifling was obviously bad. I have never seen one like that. I don't even know how they could make it turn out that way. Weird.

 

[DirtyHairy]

I said almost because I have seen a handful (less than 10) of barrels over 40 years that the rifling was obviously bad. I have never seen one like that. I don't even know how they could make it turn out that way. Weird.

Yeah this was with the original 460 I bought. The one I'm having problems with now is the replacement.


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[DirtyHairy]

They definitely oversized it, compare the size of this one to the previous photo (ignoring the previous photos rifling). They also adjusted the yoke and replaced the cylinder. The play in lock up is now nearly non existent, and the B/C gap is less than .005, which is the smallest my feeler gauge goes. The forcing cone isn't factory smooth, but I'm taking it shooting tomorrow so we'll see how it performs.


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