Bulging Brass, new Rossi R92 .357

Cornelius · Mar 8, 2019

So I have searched the forum for a previous thread to no avail.

I recently bought my first Rossi R92, my first 92-style lever action rifle.

At the range, I noticed a slight case deformation near the base of every single case after they were thrown. I ejected a couple gingerly to make sure it wasn't impact damage.

I just want to confirm that this is normal forming to the chamber for this style action/gun before I use it any further. I used both federal and Geco brass and the bulge is identical on all of them, so I don't think it was an ammo quality issue.

I may just be inexperienced with this rifle and overreacting, but I thought since I joined this group I should ask.

Appreciate any help.

Mike · Mar 8, 2019

I saw your question in the other thread. I posted my reply to you below.

https://www.mdshooters.com/showpost.php?p=5507233&postcount=26

I'm having difficulty seeing the bulge you are describing. Maybe I'm looking for the wrong thing?

Cornelius · Mar 8, 2019

Mike said:
I saw your question in the other thread. I posted my reply to you below.

https://www.mdshooters.com/showpost.php?p=5507233&postcount=26

I'm having difficulty seeing the bulge you are describing. Maybe I'm looking for the wrong thing?

Thanks for your response,

Maybe bulging is the wrong word. Deformation is probably more accurate, about .5cm above the rim. You can see it best I suppose in the top photo.

Cornelius · Mar 8, 2019

Mike said:
I saw your question in the other thread. I posted my reply to you below.

https://www.mdshooters.com/showpost.php?p=5507233&postcount=26

I'm having difficulty seeing the bulge you are describing. Maybe I'm looking for the wrong thing?

I just saw your response on the other post. That's the exact issue I'm referring to. I have to think it's just forming to the feed ramp and I'm just not used to seeing it so pronounced.

Mike · Mar 8, 2019

Yes, based on the shape and consistent position, I think it is from the feed ramp.

John from MD · Mar 8, 2019

Send it back, the chamber is not cut correctly or they over chamferred it.

Cornelius · Mar 8, 2019

John from MD said:
Send it back, the chamber is not cut correctly or they over chamferred it.

So you think that Mike and I both have defective rifles?

John from MD · Mar 8, 2019

It wouldn't surprise me as Rossi's quality has been on the wane. The case in an 1892 style rifle should be fully supported and should not bulge on firing.

Cornelius · Mar 9, 2019

John from MD said:
It wouldn't surprise me as Rossi's quality has been on the wane. The case in an 1892 style rifle should be fully supported and should not bulge on firing.

No doubt it is a cheap lever, but as I look more closely, there is a defined feed ramp that aligns perfectly with the deformation. the case is not intended to be fully supported in Rossi's 92 offering it would seem. take a look and let me know.

Also, I tried to no avail to post this right-side-up. But you get the point

zoostation · Mar 9, 2019

John from MD said:
Send it back, the chamber is not cut correctly or they over chamferred it.

This.

John from MD · Mar 9, 2019

What you are looking at is the barrel chamber. There is no separate feed ramp on the 1892 style rifle. When done properly, the edge of the chamber is chamfered lightly and the cutouts are made for the extractor and ejector. If you had a headspace problem, the brass would be expanded around the entire case. As it is, someone did a sloppy job of either cutting the chamber or chamfering the mouth.

Sorry, but you need to return it and they'll rebarrel it.

Mike · Mar 9, 2019

Cornelius said:
So you think that Mike and I both have defective rifles?

This is what I could get a picture of on my rifle. All the debris in the last picture is lint from a tissue. The little “ditch” can be seen at the top of the feed ramp. I think that is the source of the crescent deformation in most of my brass. Note my 38 SPL and the 357 Fiocchi brass did not have the deformation.

Doco Overboard · Mar 9, 2019

Looks like a lot of material has been removed from the chamber and could extend in to an area not supported by the head of the case. Cut up a fired case and measure it to see if it is thinning. If you don't have any babbitt or cerro material to make a cast, you can melt powdered yellow sulfur from the rx and use that if your handy. Just don't do it in the house or breathe that mess in unnecessarily.
A sulfur cast will be brittle but if done right will show abnormalities. Warming the dried parts with a hair dryer is a +

Cornelius · Mar 9, 2019

John from MD said:
What you are looking at is the barrel chamber. There is no separate feed ramp on the 1892 style rifle. When done properly, the edge of the chamber is chamfered lightly and the cutouts are made for the extractor and ejector. If you had a headspace problem, the brass would be expanded around the entire case. As it is, someone did a sloppy job of either cutting the chamber or chamfering the mouth.

Sorry, but you need to return it and they'll rebarrel it.

Thanks for your input, I dread having to send it back but I supposed it'll have to go. DANG IT!

Magnumite · Mar 9, 2019

I am going to cry excessive headspace. What caught my attention is the way the rim is deformed forward in the first pic of the OP.
357 Mag headspaces on the rim. The second pic in the OP shows what appears to be an extractor mark in the extractor groove. It coincides with the rim deformation. In the first pic you can see a section of the rim pushed forward. What may be occurring is the bolt side of the extractor is supporting the rim while the remainder of the rim is pushed back by case thrust during firing.

If it was pressure bulge at the feed ramp we would probably see impressions of the two square cut sections in that part of the barrel. Just my .02

Cornelius · Mar 9, 2019

Magnumite said:
I am going to cry excessive headspace. What caught my attention is the way the rim is deformed forward in the first pic of the OP.
357 Mag headspaces on the rim. The second pic in the OP shows what appears to be an extractor mark in the extractor groove. It coincides with the rim deformation. In the first pic you can see a section of the rim pushed forward. What may be occurring is the bolt side of the extractor is supporting the rim while the remainder of the rim is pushed back by case thrust during firing.

If it was pressure bulge at the feed ramp we would probably see impressions of the two square cut sections in that part of the barrel. Just my .02

Yeah, it's kinda hard to show in photos, but the case appears to be pressure-formed to a bad chamber. I'm bummed. Shoots great too.

cowboy321 · Mar 9, 2019

John is correct!! Send the rifle back.

cowboy321 · Mar 9, 2019

John from MD said:
What you are looking at is the barrel chamber. There is no separate feed ramp on the 1892 style rifle. When done properly, the edge of the chamber is chamfered lightly and the cutouts are made for the extractor and ejector. If you had a headspace problem, the brass would be expanded around the entire case. As it is, someone did a sloppy job of either cutting the chamber or chamfering the mouth.

Sorry, but you need to return it and they'll rebarrel it.

Yes indeed..

Doctor_M · Mar 9, 2019

Don't risk it. Rossi should make this right. Do it now and they should cover the full cost. I waited too long to send a rifle back to Chiappa and they made me eat the shipping.

Cornelius · Mar 9, 2019

Mike said:
This is what I could get a picture of on my rifle. All the debris in the last picture is lint from a tissue. The little “ditch” can be seen at the top of the feed ramp. I think that is the source of the crescent deformation in most of my brass. Note my 38 SPL and the 357 Fiocchi brass did not have the deformation.

I just realized that the 38spl and Fiocchi may not have had enough pressure to form the case or cause a problem. The federal and surprisingly the Geco can be pretty stout. Calling them Monday, I'll fill you in.

Bulging Brass, new Rossi R92 .357

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