biglou13 Posted April 7, 2017 Share Posted April 7, 2017 a friend is having issues with soft primer strikes just being technical using a stand dial mic. comparator (https://www.midwayusa.com/product/310955/rcbs-case-master-concentricity-gaging-tool) i measure bottom of case for lowest reading then zero then measure primer surface what is (rule) specification for primer seating depth? this is on 9mm Link to comment Share on other sites More sharing options...
MemphisMechanic Posted April 7, 2017 Share Posted April 7, 2017 (edited) On what kind of gun? With a Glock and M&P, even with slightly lighter striker springs, I always adheared to "if it's flush, then it's good." When setting up my first hammer fired DA/SA gun I learned this isn't really true. FULLY seated in 9mm is usually .005" - .008" below flush. A gun with a light hammer spring will often set off a buried CCI, and choke on a flush Winchester. (If you're not aware, CCI primers are harder to ignite than Winchesters on an equal playing field.) For an extreme example, look at what the wheelgun guys do in order to shoot something with a light trigger pull. This is necessary with federal primers, even: Edited April 7, 2017 by MemphisMechanic Link to comment Share on other sites More sharing options...
Guy Neill Posted April 7, 2017 Share Posted April 7, 2017 With normal tolerances, the primer face should be 0.003 to 0.005 inches below the case, though I have seen factories allow anything from 0.000 to 0.008 inches. Overall, what you want is the primer anvil legs against the bottom of the primer pocket. The three to five thousandths usually gives reliable performance. Guy. Link to comment Share on other sites More sharing options...
biglou13 Posted April 7, 2017 Author Share Posted April 7, 2017 Thanks all. I measure a few of mine and got .003 avg.. Next question ion my friend loads on a 650 ( I load on 550). What could be going wrong other than bad QC ? on 550 I'd look at primer cup adjustment ,. I know little to nothing if 650. Link to comment Share on other sites More sharing options...
Guy Neill Posted April 7, 2017 Share Posted April 7, 2017 Did any of the light primer strikes fire on a second try? The 0.003" should be suitable unless the anvil legs are not against the bottom of the primer pocket. This could be that primers are on the shorter side and/or the primer pockets are on the deeper side. You might try one or two things. First - how does it do with factory ammunition? If factory ammunition gives the same problems you may suspect the gun, Alternately, load a batch of ammunition and sort by primer seating depth, looking for a group 0.005 - 0.006 inch deep see how they work in the gun. Guy Link to comment Share on other sites More sharing options...
MemphisMechanic Posted April 7, 2017 Share Posted April 7, 2017 What are these being shot through? Does it have a factory hammer/striker spring? What brand of primer is being loaded? There is no adjustability on the 650 for the priming mechanism. The punch seats them as deeply as it seats them, and that's the end of it. I've tried several fixes to make my 650 drive primers all the way home, and not even shimming the primer ram has helped. Link to comment Share on other sites More sharing options...
biglou13 Posted April 7, 2017 Author Share Posted April 7, 2017 Factory guns/ springs. cci primers... ( I'll confirm tomorrow) small percentageage fuctioned on second strike. Saved most to analyze. 100% on factory ammo 100% on my reloads ( 550, Winchester primer, mixed brass, title group) Link to comment Share on other sites More sharing options...
TDA Posted April 9, 2017 Share Posted April 9, 2017 Sounds like you friend just isn't pushing hard enough on the handle to seat the primers. Don't bother measuring, just seat them fully in the case. You might make sure that the primer punch hasn't loosened up and backed out a bit. Link to comment Share on other sites More sharing options...
biglou13 Posted April 10, 2017 Author Share Posted April 10, 2017 he got back to me and said he found a loose primer while cleaning the 650.. he thinks this was the problem.... thanks all Link to comment Share on other sites More sharing options...
tcoz Posted April 13, 2017 Share Posted April 13, 2017 If this is the same friend who is having a problem with light charges and if the loose primer doesn't solve both issues, he'd be well advised to re-evaluate his reloading procedures before something more serious happens. Link to comment Share on other sites More sharing options...
biglou13 Posted April 13, 2017 Author Share Posted April 13, 2017 Yep same guy.,, Link to comment Share on other sites More sharing options...
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