shooterbenedetto Posted February 17, 2007 Share Posted February 17, 2007 I shoot 9mm open load is n350 7.3 aol is 1.164 zero jhp cripm is .373 gun would shoot about 4 to 5 rounds and then slide would stay open and when i eject my round, I noticed that there is a shaving of bullet and it looks like a washer? of course the slide woulndt close completely. any help would be appreciatled. Link to comment Share on other sites More sharing options...
HSMITH Posted February 17, 2007 Share Posted February 17, 2007 Crimp is way tight, measure the wall thickness of the case, multiply that times two, add the bullet diameter and you have the dimension that your crimp SHOULD be. Are you seating and crimping in one step? If so, with a crimp that tight the crimp will be digging into the bullet before the seating is done, that can scrape the bullet enough to make a ring looking piece of copper. Would it be possible to post a picture of the piece that is locking up your gun? Link to comment Share on other sites More sharing options...
blue edge Posted February 17, 2007 Share Posted February 17, 2007 freebore? Link to comment Share on other sites More sharing options...
shooterbenedetto Posted February 17, 2007 Author Share Posted February 17, 2007 I just measured brass with powder on my 650 dillon it is .385 without the bullet. should i crimp to .380? Link to comment Share on other sites More sharing options...
HSMITH Posted February 17, 2007 Share Posted February 17, 2007 No, case wall thickness, just the thickness of one side of the case, should be .010-.012". You are looking for something in the .377" range I would think. Link to comment Share on other sites More sharing options...
Flexmoney Posted February 17, 2007 Share Posted February 17, 2007 you need to measure just one wall of your brass. It should be something close to 0.010 inches. Make sure that you aren't measuring any flare from your powder die. you will have two wall thicknesses, along with your bullet, that make up your diameter. So, double the wall measurement and add in the bullet measurement. ***If*** you have a 0.356 bullet and a wall of 0.010, the you are looking at going off of 0.376 (.356 + .010 + .010 = .376) The 0.385 you measured with powder...that sounds like you measured a flared case. (more on that in a minute) Measure everything again and let us know what you come up with. Now...those brass shavings...are they half-mooned shaped or full circles ? And, are you seating and crimping in the same station ? Link to comment Share on other sites More sharing options...
Sestock Posted February 17, 2007 Share Posted February 17, 2007 Where is the brass shavings, are they toward the base of the case? Link to comment Share on other sites More sharing options...
shooterbenedetto Posted February 17, 2007 Author Share Posted February 17, 2007 ok I measured my brass and it is 0.012 my zero bullet is .356 jhp 124g so .356 + .024 =.380? right this should be my crimp. the washer is a full circle stuck at the base of the bullet when I eject the round. Link to comment Share on other sites More sharing options...
HSMITH Posted February 17, 2007 Share Posted February 17, 2007 Pictures man, show us what it looks like. If you don't have pictures try to give some rough dimensions of the washer thing you have, thickness, width, and ID/OD. Yes, if you are using brass that is 12 thou thick and a .356" bullet you need to be somewhere around .380" for the case mouth after crimp. Your math is good, double check the components and then make it so. Are you seating and crimping in one die or two? Link to comment Share on other sites More sharing options...
shooterbenedetto Posted February 17, 2007 Author Share Posted February 17, 2007 i would post the picture but I lost the only round that i kept that has the ring? apparently i only kept one round. Thanks for all the help guys YOU GUYS ARE THE BEST!! Link to comment Share on other sites More sharing options...
gans Posted February 17, 2007 Share Posted February 17, 2007 Excessive pressure will do that. The base of the bullet will mushroom a bit on ignition. If the pressure is excessive, the base will flatten out too much and a ring of brass will be shaved off. The following round will then fit through the ring and will not fully chamber because of the additional length of the ring. Link to comment Share on other sites More sharing options...
open17 Posted February 17, 2007 Share Posted February 17, 2007 Is this a new gun or new barrel? I've had it happen when there was a small burr left at the end of the chamber from the chambering reamer. Link to comment Share on other sites More sharing options...
Sestock Posted February 17, 2007 Share Posted February 17, 2007 I sounds like the brass was previously shot out of a glock or another 9mm that had an unsupported chamber. Do you have access to a Case-pro or at least an undersized sizing die {i.e. an EGW}. That may solve your problem. Link to comment Share on other sites More sharing options...
shooterbenedetto Posted February 18, 2007 Author Share Posted February 18, 2007 crimped .380 all my ammo and tried today..PROBLEM SOLVED the gun is flawless on all 6 stages today!!!! Thanks for everyones's help and Yes this is a new open gun. KKM barrel Link to comment Share on other sites More sharing options...
HSMITH Posted February 18, 2007 Share Posted February 18, 2007 Good to hear. Link to comment Share on other sites More sharing options...
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