Talon75 Posted July 31, 2018 Share Posted July 31, 2018 I've only had a few on some loads I've done so far, but found a bunch of these on some Fiochi 115gr rounds I've been using up. Just wondering how bad this is, a and should it be happening with factory stuff, or is there something else I should be looking at (issue with my gun?). Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2018 Share Posted July 31, 2018 17 minutes ago, Talon75 said: I've only had a few on some loads I've done so far, but found a bunch of these on some Fiochi 115gr rounds I've been using up. Just wondering how bad this is, a and should it be happening with factory stuff, or is there something else I should be looking at (issue with my gun?). Those are nothing. Link to comment Share on other sites More sharing options...
kneelingatlas Posted July 31, 2018 Share Posted July 31, 2018 Good to go Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2018 Share Posted July 31, 2018 This is a flat primer! Link to comment Share on other sites More sharing options...
radny97 Posted July 31, 2018 Share Posted July 31, 2018 Those aren’t flattened Link to comment Share on other sites More sharing options...
Nevadazielmeister Posted July 31, 2018 Share Posted July 31, 2018 7 hours ago, Talon75 said: I've only had a few on some loads I've done so far, but found a bunch of these on some Fiochi 115gr rounds I've been using up. Just wondering how bad this is, a and should it be happening with factory stuff, or is there something else I should be looking at (issue with my gun?). Those are not flattened at all. The things to look out for are the roundness of the edges of the primer cup and the firing pin indentation. I would guess that those primers are telling you the load is very light and pressures almost non-existent, which translates to higher profits and better insurance premiums for the manufacturer. They only want your gun to go pew, nothing more. The lighter the pew, the safe every one is they guess. And yes, I agree with Kevin in a previous post, who provided an example of flatten primers. But please beware that primer flattening is only one piece to the reloading puzzle. There are other things to look out for. I would recommend buying a reloading manual and understanding what the round is telling you before reloading a lot more. Good luck! Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted July 31, 2018 Share Posted July 31, 2018 8 hours ago, Talon75 said: is there something else I should be looking at (issue with my gun?). What was the velocity on those rounds ? That will offer a clue What is the powder and charge ? Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2018 Share Posted July 31, 2018 1 hour ago, Hi-Power Jack said: What was the velocity on those rounds ? That will offer a clue What is the powder and charge ? I think those are factory loads if I understood correctly. Link to comment Share on other sites More sharing options...
Talon75 Posted July 31, 2018 Author Share Posted July 31, 2018 Thanks all, and thanks for the pic Sarge, that is more helpful. Yes these were on factory rounds that I only chrono'd a few and were about 1150. Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2018 Share Posted July 31, 2018 And just for the record isn’t doesn’t take a 9MAJOR load to see high pressure. You’ll not my pic shows an M&P striker mark. The gun in question was a Production gun at the match Link to comment Share on other sites More sharing options...
Talon75 Posted July 31, 2018 Author Share Posted July 31, 2018 (edited) So I have read Modern reloading 2nd edition, is there another good source that might be better? Honestly seemed to be more about how Lee products are better than others, which made it hard to think the rest of the info is that good. Edited July 31, 2018 by Talon75 Link to comment Share on other sites More sharing options...
BigMoneyGrip Posted July 31, 2018 Share Posted July 31, 2018 Your primers look fine. Here is another example of a flat primer. Link to comment Share on other sites More sharing options...
Steve RA Posted July 31, 2018 Share Posted July 31, 2018 That would certainly get an "A" for flatness !!! Link to comment Share on other sites More sharing options...
slayer61 Posted July 31, 2018 Share Posted July 31, 2018 (edited) While we are talking about flattened primers, could I get some advice on these 357 Sig rounds? Is this really an overpowered load? It's "book max".Or bad headspace? I could use some input Edited July 31, 2018 by slayer61 Link to comment Share on other sites More sharing options...
MikeyScuba Posted July 31, 2018 Share Posted July 31, 2018 2 hours ago, BigMoneyGrip said: Your primers look fine. Here is another example of a flat primer. I’ve got one of those from my brass scrounging, wouldn’t fit in the press and kept it around as a curiousity. Now I now what it is. Link to comment Share on other sites More sharing options...
9x45 Posted July 31, 2018 Share Posted July 31, 2018 (edited) slayer, which gun are you running the 357SIG in? A Glock will have a more pronounced, almost flowing, primer strike on the 357SIG than any other caliber. In your case the primer edges are still round, but that's a weird looking firing pin mark. Actually looks very much like the strike marks from my 9mm JRC carbine. It's just the way that carbine runs. 124 Bayou TC on top of 3.4 grs TG at 1.100" This is a flat primer... Edited July 31, 2018 by 9x45 Link to comment Share on other sites More sharing options...
GrumpyOne Posted July 31, 2018 Share Posted July 31, 2018 1 hour ago, slayer61 said: While we are talking about flattened primers, could I get some advice on these 357 Sig rounds? Is this really an overpowered load? It's "book max".Or bad headspace? I could use some input Soft primer + high pressure cartridge + oversized firing pin hole = those cases. The primer has flowed on those cases a bit, but with the edges of the primer still being round, I don't think they are overpressure. Link to comment Share on other sites More sharing options...
theWacoKid Posted August 1, 2018 Share Posted August 1, 2018 This is fun. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted August 1, 2018 Share Posted August 1, 2018 5 hours ago, Steve RA said: That would certainly get an "A" for flatness !!! I believe it's an "F" for Flatness Link to comment Share on other sites More sharing options...
Steve RA Posted August 1, 2018 Share Posted August 1, 2018 "A" for excellence, "F" for failure. Obviously it held on until the very end ! Link to comment Share on other sites More sharing options...
Steve RA Posted August 1, 2018 Share Posted August 1, 2018 Glad I wasn't shooting any of those in the last picture !!! Link to comment Share on other sites More sharing options...
Nevadazielmeister Posted August 1, 2018 Share Posted August 1, 2018 17 hours ago, Talon75 said: So I have read Modern reloading 2nd edition, is there another good source that might be better? Honestly seemed to be more about how Lee products are better than others, which made it hard to think the rest of the info is that good. I personally read the Lyman Manual about 30 years ago and learned a great deal. (https://www.amazon.com/Lyman-50th-Reloading-Handbook-Hardcover/dp/B01HH08L1A/ref=sr_1_3?ie=UTF8&qid=1533122658&sr=8-3&keywords=modern+reloading+2nd+edition). That link is for the 50th edition, I'm guessing mine was an earlier version. Yeh, I understand your concern in that you wonder if the manual is unbiased. The nice thing is the Lyman only makes a few reloading components and concentrates more on cartridge reference. Link to comment Share on other sites More sharing options...
slayer61 Posted August 1, 2018 Share Posted August 1, 2018 16 hours ago, 9x45 said: slayer, which gun are you running the 357SIG in? A Glock will have a more pronounced, almost flowing, primer strike on the 357SIG than any other caliber. In your case the primer edges are still round, but that's a weird looking firing pin mark. Actually looks very much like the strike marks from my 9mm JRC carbine. It's just the way that carbine runs. 124 Bayou TC on top of 3.4 grs TG at 1.100" This is a flat primer... The gun is a Sig Sauer P229 in 357 Sig Link to comment Share on other sites More sharing options...
slayer61 Posted August 1, 2018 Share Posted August 1, 2018 15 hours ago, GrumpyOne said: Soft primer + high pressure cartridge + oversized firing pin hole = those cases. The primer has flowed on those cases a bit, but with the edges of the primer still being round, I don't think they are overpressure. Grumpy, the primers are CCI spp, (not known for being soft like Federal) After the range day that these were shot, the pistol went to my local smith who went through the pistol front to back and said all dimensions were within spec. I'm still puzzled Link to comment Share on other sites More sharing options...
slayer61 Posted August 1, 2018 Share Posted August 1, 2018 (edited) Obviously not a 9mm, but these are flat primers from my revolver! Edited August 1, 2018 by slayer61 Link to comment Share on other sites More sharing options...
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