John Boy Posted November 23, 2016 Share Posted November 23, 2016 Background: After close to 15,000 BP rounds shot in my favorite Rossi M92 that is slicked up, started getting light primer hits - about 20% of the reloads with CCI 300 LP's. * Fired some CCI LP's in stock Vaquaro - measured primer indent with hardness tester = 0.070 * Cleaned the internals and fired more CCP LP's in the Rossi - measured primer indent with hardness tester = 0,032 indent * Put shims between the hammer and firing pin to determine if the hammer face needed to be filed to squarely hit the pin. No Go igniting the primers So, added a 0.030 shim to the main spring and started testing multiple brands of LP primers ... CCI 300, S&B LP, Winchester LP, Remington 2 1/2 LP and Federal LP's. Only 2 brands ignited the primers Yes, as with common knowledge, the Federal LP's ignited 6 in a row, But ... Remington 2 1/2's also ignited 6 in a row So, in the future for the Dillon 550B primer tubes they will charged with either the Federal or Remington's for use in the Rossi. Now I have to mark all the reload boxes with the CCI 300's and use them in the stock revolvers or in the other levers that are stock Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted November 23, 2016 Share Posted November 23, 2016 JB, you have confirmed the there is no interference with the hammer fall in the rifle, 'rite'? Could it be a HS issue with the rifle? Have you ck'd the OAL of the FP with a new one? Is the 92's hammer spring a flat spring or coil? Bet the spring has taken a 'set'. OLG Link to comment Share on other sites More sharing options...
Marauder SASS #13056 Posted November 23, 2016 Share Posted November 23, 2016 Thanks for the validation! Also, how old is the hammer spring? They do eventually wear out - not as much from time but from cycling. Link to comment Share on other sites More sharing options...
John Boy Posted November 23, 2016 Author Share Posted November 23, 2016 Grits ... * No interference with the hammer fall IN the rifle * Believe the main spring was giving up the ghost. That's why I shimed it * No, I did not measure the firing pin nor have I spent $45 for a new one. Did compare the extended length to another Rossi - looked to be the same * Rossi main springs are coil Marauder: I'm guessing but the shortened main spring when I slicked the rifle has maybe 5000 or so rounds working the hammer Link to comment Share on other sites More sharing options...
Cliff Hanger #3720LR Posted November 23, 2016 Share Posted November 23, 2016 I shoot Rossi 92s. When I start getting light primer hits, it usually turns out to be a broken firing pin, free floating in the bolt block. If it is used in this condition for any length of time, the firing pin will peen at the break from repeated strikes and can get to the point the firing pin will not come out of the bolt with out a lot of work. The break is usually where the firing pin is notched for the breech bolt locks. Link to comment Share on other sites More sharing options...
Bramble Mountain Buzzard Posted November 23, 2016 Share Posted November 23, 2016 Being that CCI and Federal primers are now being made in the same building here in Minnesota, and have been for a couple years now, I find it hard to believe that they would manufacture to 2 different specs. I would question the main spring as being what Lumpy Grits called "taking a set." Link to comment Share on other sites More sharing options...
Colorado Coffinmaker Posted November 24, 2016 Share Posted November 24, 2016 And ... You'd be wrong. Link to comment Share on other sites More sharing options...
Nate Kiowa Jones #6765 Posted November 24, 2016 Share Posted November 24, 2016 I shoot Rossi 92s. When I start getting light primer hits, it usually turns out to be a broken firing pin, free floating in the bolt block. If it is used in this condition for any length of time, the firing pin will peen at the break from repeated strikes and can get to the point the firing pin will not come out of the bolt with out a lot of work. The break is usually where the firing pin is notched for the breech bolt locks. If the Rossi FP is not broke in the middle (the thin part) check for adequate tip protrusion. you should see at least .030" .030 ' Link to comment Share on other sites More sharing options...
John Boy Posted November 24, 2016 Author Share Posted November 24, 2016 Being that CCI and Federal primers are now being made in the same building here in Minnesota, and have been for a couple years now, News to me: CCI - Lewiston, ID Federal - Anoka, MN Link to comment Share on other sites More sharing options...
John Boy Posted November 24, 2016 Author Share Posted November 24, 2016 If the Rossi FP is not broke in the middle (the thin part) check for adequate tip protrusion. you should see at least .030 Guess my pin is not broken. I checked the morning with magnets: Cleaned the internals and fired more CCP LP's in the Rossi - measured primer indent with hardness tester = 0,032 indent. Haven't measured the primer indents for the Remington & Federal primers that ignited - but will! Link to comment Share on other sites More sharing options...
Attica Jack #23953 Posted November 24, 2016 Share Posted November 24, 2016 I always thought that Federal primers were the easiest to set off, followed by Winchester and with CCI being the hardest. Link to comment Share on other sites More sharing options...
LQ Jones Posted November 24, 2016 Share Posted November 24, 2016 Check the headspace, and go backwards from there. LQ Link to comment Share on other sites More sharing options...
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