latech15 Posted April 3, 2011 Share Posted April 3, 2011 I have been shooting a new to me SV 9mm open gun for a few months now with minor loads only. I just got in a shipment from Montana gold and decided to try major loads. I put in new springs and made up some autocomp loads and tried them out. At first i was getting 1in 10 light strikes with no bang and it got to the point where it was more like 5 in 10. Barely a dimple in the primers. I swapped mainsprings sit my limited gun, firing pins, fb springs, recoil springs, nearly everything I could think of. I tried the pencil trick, where you drop a pencil down in the barrel and see if it will shoot out just from the firing pin hitting it. It would shoot out but only a little bit. I swapped msh's with the limited gun again, and still wouldn't shoot it out nearly as far as the limited gun. I have ordered a new 17 lb ms and a xl firing pin, which I think will fix the problem but it is really bugging me. Anybody got any thoughts as to why? Oh, btw, minor loads still fire off perfectly. Link to comment Share on other sites More sharing options...
belus Posted April 3, 2011 Share Posted April 3, 2011 Just to be sure, you're using the same primers in each load? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 3, 2011 Share Posted April 3, 2011 Just to be sure, you're using the same primers in each load? +1. If you just switched to Russian primers, they can be tough to set off. Link to comment Share on other sites More sharing options...
Ronnie j Posted April 3, 2011 Share Posted April 3, 2011 Primers seated deep enough? Will they fire if you strike they again? Link to comment Share on other sites More sharing options...
latech15 Posted April 3, 2011 Author Share Posted April 3, 2011 CCI primers in both cases. Most will NOT go off if shot again. Every once in a while I get one where I can thumb cock the gun and it will go off but most won't fire at all. I tried as many as 5 times with some rounds. OAL is different. The major stuff is loaded to 1.170 and the minor stuff is a tad shorter. I can't figure out how that would make a difference, but you guys are smarter than me so I thought I'd throw it out there. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted April 3, 2011 Share Posted April 3, 2011 Hello: Are your major loads too long and hitting the barrel lands so that the rounds are not going into battery? Thanks, Eric Link to comment Share on other sites More sharing options...
Pro2AInPA Posted April 3, 2011 Share Posted April 3, 2011 Hello: Are your major loads too long and hitting the barrel lands so that the rounds are not going into battery? Thanks, Eric This was the only thing I could think of as well. Which bullets are you using? Link to comment Share on other sites More sharing options...
latech15 Posted April 3, 2011 Author Share Posted April 3, 2011 It is possible. The slide is going all the way in to battery so I would assume the rounds are as well. Minor bullets are moly. Major are MG 124's Link to comment Share on other sites More sharing options...
latech15 Posted April 3, 2011 Author Share Posted April 3, 2011 The three on the left were the minor PF stuff that did go off. The one on the right was major PF that DID go BANG. This is a close up of the major PF one. Here are two major PF ones that wouldn't go off with four tries. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 3, 2011 Share Posted April 3, 2011 Are you spraying your empty cases with a lubricant before you reload them with the 9mm major, but not with the 9mm minor. Some sprays can cause problems with ignition?? Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 No, actually the other way around. I used Hornady One shot with the minor stuff and nothing on the major rounds. I cut four coils off of the firing pin spring today and fires 50 or so rounds with all going bang. It is apparently fixed for the short term and I think that the XL firing pin will fix it permanently, but it still is a mystery as to what is causing this. Link to comment Share on other sites More sharing options...
Joe4d Posted April 4, 2011 Share Posted April 4, 2011 excessive headspace or your gun is headspacing with the extractor, the major rounds cycle the rounds harder and jam the rounds a bit farther in the barrel than the minor loads. Pull the barrel and check the headspace. Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 Joe, NOW I think you are on to something. I did notice that all of these rounds have too much crimp on them. That could cause them to dive deeper into the actual barrel rather than headspacing on the case mouth. So the fix is obviously to fix the crimp issue, but could it be a loose extractor as well? Link to comment Share on other sites More sharing options...
Joe4d Posted April 4, 2011 Share Posted April 4, 2011 headspacing with the extractor is bad, think about sticking a 9mm in a 9X23 chamber, the extractor will sometimes hold it tight enough for the firing pin to set off the primer. But an extractor is designed to extract, not to headspace. If a loose extractor is causing light strikes your brass isnt chambering on the case mouth like it should. Pull the barrel and drop the rounds in, you should get a nice solid "chunk" sound with the primer flush with the hood, turn the barrel up and the round should fall out.. Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 No chunk sound. It stops about 1/16 from there. It goes in the rest of the way with very light finger pressure and is headspacing correctly at that point. No drop in and chunk though. Drops right in my case gauge with a chunk though. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted April 4, 2011 Share Posted April 4, 2011 Hello: I see a EGW "U" die in your future since it will not drop in your chamber with the highly technical "Chunk" sound Thanks, Eric Link to comment Share on other sites More sharing options...
Powder Finger Posted April 4, 2011 Share Posted April 4, 2011 The three on the left were the minor PF stuff that did go off. The one on the right was major PF that DID go BANG. This is a close up of the major PF one. Here are two major PF ones that wouldn't go off with four tries. Primer flow into firing pin hole in breach face. Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 Caused by hot loads or what? I agree on the u die. Its on the list. That however, wouldn't have anything to do with the light strikes would it? The force required to push the round down into the barrel until you get the solid headspacing feel and sound is literally a few ounces. Really nothing at all. Link to comment Share on other sites More sharing options...
Brazos Custom Posted April 4, 2011 Share Posted April 4, 2011 Your second picture shows really bad primer flow which will clog up your firing pin hole very quickly. Run a pipe cleaner through the hole and clean it out completely. The third picture from what I can see looks like high primers and imprints from debris left over from the shaved primer material which will also cause misfires. Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 How do you stop primer flow? The third picture shows primers that were hit with 4 or 5 light strikes in the gun. The primers were fine when I put them in the first time. Primers were fully seated. As fully seated as a 550 will allow them to be. Link to comment Share on other sites More sharing options...
Singlestack Posted April 4, 2011 Share Posted April 4, 2011 How do you stop primer flow? The third picture shows primers that were hit with 4 or 5 light strikes in the gun. The primers were fine when I put them in the first time. Primers were fully seated. As fully seated as a 550 will allow them to be. By reducing the pressure. You have to change something if you are getting primer flow. Powder, bullet, primer, OAL, something. Your pressure is too high and you are risking a kaboom. Primer flow is caused by over pressure. Link to comment Share on other sites More sharing options...
Powder Finger Posted April 4, 2011 Share Posted April 4, 2011 (edited) Before you go about stopping primer flow you need to chrono the loads and find out if it's just plain over pressure. If your velocity is in line then you can go to a larger dia firing pin, different primers, ETC........ It kind of all starts with what you are loading now (your load, primer/powder/bullet/velocity) then recomendations on how to proceed I'm sure will follow. I just saw the above post #21 and agree completely. Back off the powder a little then do the stuff above and work up slow. Bottom line is you are melting metal. Edited April 4, 2011 by Powder Finger Link to comment Share on other sites More sharing options...
Loves2Shoot Posted April 4, 2011 Share Posted April 4, 2011 Are you using small pistol or small rifle primers? Link to comment Share on other sites More sharing options...
latech15 Posted April 4, 2011 Author Share Posted April 4, 2011 CCI Small pistol primers Autocomp 6.7 grains 169 pf 124 gr mg's 1.170 OAL Link to comment Share on other sites More sharing options...
Powder Finger Posted April 4, 2011 Share Posted April 4, 2011 (edited) CCI Small pistol primers Autocomp 6.7 grains 169 pf 124 gr mg's 1.170 OAL Don't know about the other stuff but these look suspect. Edited April 4, 2011 by Powder Finger Link to comment Share on other sites More sharing options...
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