Rossi M92 357 Case Bulge - Page 3
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Thread: Rossi M92 357 Case Bulge

  1. #21
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    I had complete case head separation years back on a couple of rounds. I had 'em loaded hot and the cases were old, fired more'n once. Mine does fine if I use brand new brass. I was shooting 2400, but I can get just as fast with L'il Gun at much less pressure, loading below book anyway, so that's how I've gone. Still pushing a 165 grain gas checked SWC at over 1800 fps. Also, I use new brass reloaded no more than a couple of times when I wanna push max velocities.

    I've been shooting mostly .38 special stuff for plinking in it, but I have a supply of the hot stuff.
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  2. #22
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    Well, a week later I got to the range today. I suspect that I was putting it off expecting to find something wrong with the rifle and not wanting to do the dance with Taurus again.

    I had some 38 Special FMJ RN Herters I believe (brass case), some Remington green box 38 Special FMJ HP +P and bought 25 rounds of Fiocchi 357 Magnum at the range, both of the latter ones nickel plated cases.

    No case bulges like I experienced with my reloads. Perhaps a tiny bit of expansion at the base but I haven't measured them yet, just a visual observation. Very relieved so far that serious issues haven't been found. The 357's were certainly not "weak sisters" as I loaded up the 605 with five of them and gave it up after three rounds. No fun there at all, though in the Rossi they didn't feel much different than the 38's.
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  3. #23
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    It's gotta be the different chamber design. The feed ramp added would be the reason your ammo is not being supported in the chamber, and the reason for the bulges. chances are if you reload the cases for the factory ammo that you shot, they'll have that same bulge after being fired.
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  5. #24
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    Typicaly, those bulged cases indicate an over polished chamber. Hot loads can crack case walls without that degree of bulge. Pick up a chrony and compare factory velocities to your loads. It would give you a base line to at least match figures. When factories production cut chambers, the duller the chamber reamer, the more polish work is needed to not have sticky fired casings from deeper circular machine lines in the chamber wall. Now "polish" work can start out with as course of sand paper as 180 or 220 grit. A good sharp reamer cut would only require like 320 or 400 grit to polish the chamber walls nicely. I would guess your chamber was cut with a dull reamer that scored the walls and subsequently needed a lot of polishing with the courser paper that results in an over sized chamber. This is the old "roll of the dice" chance you take with these rather cheaper made products. I have a good Rossi M92 357 barrel that measures .386 ID at about 1/8thor so in from the chamber mouth. Beyond that it tightens to .380 from the rest of the chamber depth. A good fired casing should not be measure larger in its OD than those specs since a fired case fire forms very closely to the inner chamber dimensions. Write back with what your fired casings measure out at, at the bulge and forward. That may determine what you end up doing with the gun.
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