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SP101 forcing cone erosion

This is a discussion on SP101 forcing cone erosion within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; While cleaning my SP after a recent range trip, I noticed some erosion on the forcing cone. It's the most noticeable at 12 and 6, ...


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Old September 24th, 2011, 07:36 AM   #1
 
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SP101 forcing cone erosion



While cleaning my SP after a recent range trip, I noticed some erosion on the forcing cone. It's the most noticeable at 12 and 6, but it is all the way around the inner diameter. This barrel was replaced by Ruger due to it being crooked a year or so ago. Since then, it's had less than 500 .38 LSWC and maybe 200 357 jacketed FMJ. The last 50 were mid range loads using True Blue and 158gr jacketed.

So my question is, do I send it back to Ruger for a new barrel ($80 if they'll cover shipping both ways).

Buy the brownell's reamer ($80)
or would this do the trick? http://www.brownells.com/.aspx/pid=6...TOOL___CUTTERS

My local smith doesn't ream cones anymore. He's almost 70 and is semi-retired.

I'm reluctant to ask Ruger to fix it for free since they've already replaced the crooked barrel with a less crooked one and fixed the action after I buggered up the pawl. Plus I bought the gun used, so I feel they've already gone above and beyond.




Last edited by donkengine; September 24th, 2011 at 05:35 PM.
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Old September 24th, 2011, 07:50 AM   #2
 
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I'd send it back if they cover shipping.
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Old September 24th, 2011, 01:03 PM   #3
 
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Hi,
Pictures would be great. Since Ruger has replaced the barrel once then I don't think the cause is ammo related. Does the top strap have flame cutting? Revolvers that have a lot of flame cutting is a indication of shooting light grain high velocity 357 mag ammo. This can erode the forcing cone if the revolver has a high round count. Some pictures might give on the members a idea of what might be happening.
Regards,
Howard
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Old September 24th, 2011, 01:29 PM   #4
 
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Quote:
Originally Posted by roaddog28 View Post
Hi,
Pictures would be great. Since Ruger has replaced the barrel once then I don't think the cause is ammo related. Does the top strap have flame cutting? Revolvers that have a lot of flame cutting is a indication of shooting light grain high velocity 357 mag ammo. This can erode the forcing cone if the revolver has a high round count. Some pictures might give on the members a idea of what might be happening.
Regards,
Howard
No flame cutting at all.

I've never shot anything lighter than 140 gr. The weird thing is that I never noticed it until this last cleaning.

I will post pictures- have to put the macro lens on the nikon.
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Old September 24th, 2011, 05:36 PM   #5
 
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Pics added- took with my iPhone...too lazy to unpack the Nikon.
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Old September 24th, 2011, 06:01 PM   #6
 
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Based on the picture I would have to agree the revolver needs to go back to Ruger. Does not look like the revolver has seen a lot of full power 357 magnums.
If you send the revolver to Ruger let us know how it turns out.
Good luck,
Howard
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Old September 25th, 2011, 06:48 PM   #7
 
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While trying to get a better picture, I noticed there is just a tiny bit of flame cutting. It's so slight that I thought it was just carbon build up. Right at 12, a pick will just barely catch on it.

I only use 158gr bullets, so should I just use a slower powder? The last batch were with Ram Shot True Blue and were loaded just a tad above starting loads. A few were a little sticky to extract, but they were all the same head stamp, so I think it was jus the brass.

All previous magnum loads were with 2400 or Power Pistol.
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Old September 26th, 2011, 09:44 AM   #8
 
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Called ruger and explained the situation. I asked if it was safe to shoot it like it is and she said probably not. She suggested that I send it in so they can tell me if it is safe or not. They will not pay shipping since the gun is over a year old.

I think I will call back and get the guy I spoke to last time. I would rather send pictures than pay shipping if all they're going to do is look at it.

Last edited by donkengine; September 26th, 2011 at 11:47 AM.
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Old September 26th, 2011, 09:59 AM   #9
 
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good luck, they should treat you right. Wonder why such fast erosion, must be the treatment it got not quite up to par.....???
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Old September 26th, 2011, 03:28 PM   #10
 
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Interesting keep us posted please.
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Old September 28th, 2011, 01:30 PM   #11
 
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I've left a voicemail for the guy that helped me last time and I've used their online request form. Hopefully there will be a call back soon.
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Old September 29th, 2011, 03:12 PM   #12
 
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Haven't heard back from Ruger yet, so I figured I would clean it up a bit more and take a better look before deciding on recutting the cone vs. deburring/chamfering the leading edge.

The inside of the cone looks better than I expected so I decided to try a little light sandpaper on the outside to see if I could at least knock the sharp edges off of the erosion. A little 320 grit on the end of my finger with a twisting motion removed 95% of it. It's still visible, but only catches on my pick at one spot whereas before you could feel it almost all the way around.

Thoughts?



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Old October 6th, 2011, 07:57 PM   #13
 
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Looks fine to me. Shoot the snot out of it and enjoy!

That looks more like a build up of lead than erosion to me in your first picture.

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Old October 7th, 2011, 05:05 AM   #14
 
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I had a Blackhawk that was doing the same as yours. I could use the same loads in different gun with no problem, Blackhawk looked like an old manhole cover after a box of rounds. I ended up cutting the forcing cone to 11degs and no more problems. I think the timing might have been just a little off and it was shaving the bullets. Well worth the effort.
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