Are Rossi 92 Chambers sloppy?

[huntersdog]

I picked up a used Rossi 92 in 45 Colt, and put a shell in the chamber and it has a good deal of slop. Is that normal and anyone know what the min-max tolerances should be on a 92 45 Colt chamber?

Just making sure, it isn't way out of spec, I'm going to use a bore gage on it and get a measurement.


Edit: Fund a link where Ranch Dog seems to only gets about 5 reloads per 45 Colt in his 45 lever rifles and about the 6th reload they split.

http://www.rossi-rifleman.com/viewtopic.php?f=9&t=380&start=10

Thanks

[shoot-n-lead]

My .357 is spot-on...but, seems like I remember a guy posting on RossiRifleman, that his 44 had a generous chamber.

[huntersdog]

My .357 is spot-on...but, seems like I remember a guy posting on RossiRifleman, that his 44 had a generous chamber.I'm doing some research on them now, I don't remember reading that about Marlin's.

[shoot-n-lead]

I'm doing some research on them now, I don't remember reading that about Marlin's.

Marlin's are notorious for oversized bores.

[Harter66]

Both of mine were . They were correct at the front .25 or so with tight bbls. The back end is .487 where it should be .484 preferably .482 . The solution is to fire form via the 303 0 ring or tape method and size just the bullet grip area aka neck sizing . I have a hand full of brass with 5 loads on it in the Rossi and 20 or so in the BlackHawk before that . They will shoot good groups ,if you plan on shooting beyond a measured 75 yd bullet and load selection becomes critical . The twist is slow and supersonic loads destabilize between 78 and 82 yd with the favored Colts bullets.

On a more positive note even with the loads only reaching 1050 in the 16&20 inch bbls they kill hogs just fine from powder burn to 50 yd .

Pm me for all the details of some ongoing work .

[Taylor810]

I have a Rossi 92 in 38/357 and it was very stiff and would chew up the brass when being ejected. After a lot of gunsmithing it's running smooth, but it is very case sensitive and will only cycle 357. I use it for cowboy action and it slows me down sometimes, since it can't be short stroked.

[John Boy]

Fireform some rounds and then determine the chamber fit. Have two 45LC's and don't have your preseved issue

[w30wcf]

SAMMI specs indicate that the chamber tapers from .4800 to .4862.
Tolerance: -.000 +.004
That means that the rear of the chamber could run from .4862 to .4902.

The cartridge spec calls for a case OD of .480 - .006"
Factory cartridges I have measure .476".

So there is a bit of windage in .45 Colt chambers according to SAAMI Specs.

That is why some of us .45 Colt owners only neck size our brass, leaving the
rear portion expanded closer to the chamber dimensions. :)

w30wcf

[Harter66]

Fired case measures .4887 at the base and .4805-.4812 at the mouth from the rifles the RBH measure .484 at the breach end of the cylinder unfortunately all of the fired brass is prepped from the BlackHawk. I guess both rifles were just cut with new reamers and the BlackHawk with a half life reamer .
Wrong again I guess bulges around the head are ok.

[huntrick64]

I have the same issue and just keep my brass separate. I do not resize the entire case just down as far as the bullet seats. This keeps from over working the entire case. I anneal about 3/8" down from the mouth to soften the part I resize. This will make the brass last longer, but you can't chamber my Rossi 45 Colt brass in any other 45 colt (they are too big once you fire the brass) I call it the 45 WTH because that is what I say when I look at my brass after firing. Other than that, a great gun.

[Lonegun1894]

The twist is slow and supersonic loads destabilize between 78 and 82 yd with the favored Colts bullets.

On a more positive note even with the loads only reaching 1050 in the 16&20 inch bbls they kill hogs just fine from powder burn to 50 yd .

Pm me for all the details of some ongoing work .

I couldn't agree more with you as to them being great on hogs, but I have shot mine out to 200 yards and never had any sign of the boolit becoming unstable. May I ask what load you're using? I have used the Lee 255gr RNFP, the Lee 252gr SWC, the Lee 300gr, and the RCBS 45-270-SAA, all of them both at standard Colt loads and "Ruger-only" loads, and never had the problem you mentioned.

[Harter66]

Destabilizing is the only answer I have that makes any sense for loads from 9,5 Unique to 19.3 H110 under 452-252 @ 265gr ,452-255 @265gr ,454424 @ 257gr and a paper patched 429421 @ 256 and .448 dia. They shoot under 2" out to 75 yd then between there and the 100yd berm ,107 outside maximum they climb right over the berm rising some 6-8' . The 452-252 SWC Lee does it sooner than the others and was "discovered” shooting a load Chronyed @1050 from a 7.5 RBH . Loads that don't exceed 1100 fps with the bullets above and the 45-200 SWC RCBS do better but are still pie pan groups at 100, possibly attributed to by full length sized brass not formed to the chamber. I had to chase down all the other possible problems.
I'm currently working with a light 45-70 bullet walking the line between stability , speed and BC . I'm ready to shoot the best 3 50 yd loads at 100 now .

[Dan Cash]

My .45 Puma is very sloppy.

[Tackleberry41]

The answer is....maybe. I was worried about it when I bought my 92 in 45 colt. Just knowing if there was a junk gun, I would get it. But the bore is the right size, they do tend to vary, who knew in this day and age it was so difficult to make a rifled tube the right dimensions. The chamber seems fine. Yea it felt like it was full of sand when I first got it, and you had to be serious about cycling it. Polish up the internals and it cycles fine now. I had it apart the other day to get a sling mount to fit the tube, made a brass magazine follower while I was at it.

[Lonegun1894]

Harter66,
Now that is odd! I would think if it was a stability issue, it would be very inconsistent instead of rising 6-8'@100yds as you describe though. Mine are in .357 Mag, .44 Mag, and .45 Colt, and all are good for 2.5-3"@100yds, and 6-8"@200yds. There has to be something going on with yours, but with that variety of loads, no one can say you haven't tried.

[3leggedturtle]

Yep the 45colt has sloppy chambers a lot. Mine is/was accurate but need to keep the brass separate, cuz they won't fit my other two 45's.

[runfiverun]

hmm none of mine have the oversized chambers.
bbut I don't have any of the Taurus models.
I do remember some of the marlins having pregnant brass coming out of them.

I'm just glad I bought mine back when all they did was make guns and not try to interpret them into something they don't need to be.

[huntersdog]

SAMMI specs indicate that the chamber tapers from .4800 to .4862.
Tolerance: -.000 +.004
That means that the rear of the chamber could run from .4862 to .4902.

The cartridge spec calls for a case OD of .480 - .006"
Factory cartridges I have measure .476".

So there is a bit of windage in .45 Colt chambers according to SAAMI Specs.

That is why some of us .45 Colt owners only neck size our brass, leaving the
rear portion expanded closer to the chamber dimensions. :)

w30wcf
Thanks for the specs, I can check with a bore-gage and get an idea what it is. Just seemed really sloppy, but the front of the chamber may be a bit tighter.

Thanks

[Buckshot]

.................My Rossi M92 Rifle, below: ..................

http://www.fototime.com/7848272124A4E8F/standard.jpghttp://www.fototime.com/95900A3C1D2F5E8/standard.jpg

Has a larger then desired chamber. As a matter of fact I can load the Lee 457-340-F slug sized to .457" and they'll chamber in the rifle. The rifle's barrel slugs .446" x .450" so it's tight with shallow grooves. Doesn't seem to cause any leading issues.

http://www.fototime.com/744223B96FDE8AF/standard.jpghttp://www.fototime.com/D17E117B0ED6111/standard.jpg

Here it is and one on the right lying on the lifter. Accuracy at 50 yards is pretty good, which kind of surprised me with it's 30" twist. Apparently larger then desired 45 Colt chambers must not be something too uncommon. I forget the guy's name but he's a well know revolver shooter and he remarked that most accuracy issues with the 45 Colt could be traced to oversized chambers.

..............Buckshot

[TCLouis]

I have a Braztech and the 357 chamber is fine.

[hornady308]

I have Rossi's in 357, 44 and 45. Only the 45lc has the large chamber. It shoots jacketed bullets with great accuracy at 100 yards, but I've given up trying to find an acceptable cast load, and I've tried everything I can think of from 200 to 325 grains (all from acww). The only thing left to try would be very soft and very hard cast. Good luck to you.