Petrov Posted September 28, 2023 Share Posted September 28, 2023 So I have been having trouble with really weak hits on my primers, barley a dimple in my 627. I have been treating my moonclips like magazines, just dump them in an ammo box or the range bag, pile them on top of each other fully loaded etc. Put empty brass in a moon clip in do some dry fire and observe. The brass kinda sticks out a bit from the cylinder so when the firing pin hits it whacks the primer and the brass starts to travel forward and the moon clip almost acts like a spring to absorb the kinetic energy. About half of my moon clips are a bit wonky. They dont have obvious issues but they are bent enough for one round not to ignite out of the 8. Link to comment Share on other sites More sharing options...
Joe4d Posted September 28, 2023 Share Posted September 28, 2023 9 minutes ago, Petrov said: So I have been having trouble with really weak hits on my primers, barley a dimple in my 627. I have been treating my moonclips like magazines, just dump them in an ammo box or the range bag, pile them on top of each other fully loaded etc. Put empty brass in a moon clip in do some dry fire and observe. The brass kinda sticks out a bit from the cylinder so when the firing pin hits it whacks the primer and the brass starts to travel forward and the moon clip almost acts like a spring to absorb the kinetic energy. About half of my moon clips are a bit wonky. They dont have obvious issues but they are bent enough for one round not to ignite out of the 8. I find that a bit suspect, more likely you have a headspace/ cylinder endshake problem. Not doubting your observations, just the diagnosis. If the head space is correct as the bent spot came under the firing pin it should move it up tight. Shouldn tbe enough room there. I mean even a high primer rubs and makes things tight. Link to comment Share on other sites More sharing options...
Petrov Posted September 28, 2023 Author Share Posted September 28, 2023 5 minutes ago, Joe4d said: I find that a bit suspect, more likely you have a headspace/ cylinder endshake problem. Not doubting your observations, just the diagnosis. If the head space is correct as the bent spot came under the firing pin it should move it up tight. Shouldn tbe enough room there. I mean even a high primer rubs and makes things tight. No endshake I took care of that. I do have headspace that is just outside of the specs. I think just a hair over 0.064? I dont have the numbers with me. Link to comment Share on other sites More sharing options...
ParrytheWind Posted September 28, 2023 Share Posted September 28, 2023 Bent moons will cause issues. Link to comment Share on other sites More sharing options...
Toolguy Posted September 28, 2023 Share Posted September 28, 2023 (edited) There should be .005 to .010 between the recoil shield and the head of the case. That is plenty of room for a slightly bent moonclip to cause problems. Moons need to be flat, flat, flat. Edited September 28, 2023 by Toolguy Link to comment Share on other sites More sharing options...
pskys2 Posted September 28, 2023 Share Posted September 28, 2023 28 minutes ago, Toolguy said: There should be .005 to .010 between the recoil shield and the head of the case. That is plenty of room for a slightly bent moonclip to cause problems. Moons need to be flat, flat, flat. Hey warren, heading to the irc with Darren, going to use the pro you helped me with as my main gun! It's working great. Anyone know where to find a couple of stars for a 627, my PC needs timed. Link to comment Share on other sites More sharing options...
Toolguy Posted September 28, 2023 Share Posted September 28, 2023 (edited) I don't have any new extractors, but we might be able to get you going some other way. Bring it by and we'll have a look. Edited September 28, 2023 by Toolguy Link to comment Share on other sites More sharing options...
Petrov Posted September 28, 2023 Author Share Posted September 28, 2023 Oh just in case I measured my apex firing pin, 0.480. Link to comment Share on other sites More sharing options...
Toolguy Posted September 28, 2023 Share Posted September 28, 2023 (edited) Most times, .495 is considered the minimum firing pin length. A few factory ones are that long, most are shorter. The extended ones are usually around .505 + or - a bit. With the hammer all the way down, you want the firing pin to stick out of the recoil shield about .050, the thickness of a dime. Edited September 28, 2023 by Toolguy Link to comment Share on other sites More sharing options...
Petrov Posted September 28, 2023 Author Share Posted September 28, 2023 Going to replace hammer, slide and the firing pin. All those parts I took a file/stone to without a care or clue at one point or another. Will help me to rule some things out. Getting all of the parts from TK. Link to comment Share on other sites More sharing options...
Petrov Posted September 30, 2023 Author Share Posted September 30, 2023 Well the issue is back. I have noticed something though. When it fails to fire it leaves a tiny little weak dimple. I can fail to ignite it 5 times I'm a row and it's all small weak dimple. Finally when it does go off it has a good strong firing pin impact that leaves a good dent in the primer. Link to comment Share on other sites More sharing options...
Toolguy Posted September 30, 2023 Share Posted September 30, 2023 The small dent is all you get from the firing pin. The big dent when it goes off is from the case slamming back on the firing pin when the powder lights up. Link to comment Share on other sites More sharing options...
Petrov Posted September 30, 2023 Author Share Posted September 30, 2023 Ah, I am a potato. Back to the drawing board. Link to comment Share on other sites More sharing options...
Petrov Posted October 3, 2023 Author Share Posted October 3, 2023 Guess who mistook a slightly tapered mechanical pencil spring for a firing pin spring? Its me I drank the dumb bit-h juice, the whole gallon jug. Back to consistent ignition at 7.5 pound DA pull. Link to comment Share on other sites More sharing options...
pskys2 Posted October 4, 2023 Share Posted October 4, 2023 (edited) 2 hours ago, Petrov said: Guess who mistook a slightly tapered mechanical pencil spring for a firing pin spring? Its me I drank the dumb bit-h juice, the whole gallon jug. Back to consistent ignition at 7.5 pound DA pull. you should've said tried a special wound spring and it didn't work? Just think if it had worked?! We'd all be running out to the office supply store. Edited October 4, 2023 by pskys2 Link to comment Share on other sites More sharing options...
Petrov Posted October 4, 2023 Author Share Posted October 4, 2023 1 hour ago, pskys2 said: you should've said tried a special wound spring and it didn't work? Just think if it had worked?! We'd all be running out to the office supply store. This is my performance contra axial torodial counter kinetic inline lateral performance spring. That will be 50 dollars. Link to comment Share on other sites More sharing options...
pskys2 Posted October 4, 2023 Share Posted October 4, 2023 11 hours ago, Petrov said: This is my performance contra axial torodial counter kinetic inline lateral performance spring. That will be 50 dollars. Link to comment Share on other sites More sharing options...
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