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Old 09-02-2007, 20:53   #1
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magnum pistol primers

I loaded 100 rds of 9mm with my new dies this afternoon, when I was done the 357 die set I got with my used equip. caught my eye. I set up the dies and loaded a whopping 6 rounds. When I was done, it hit me that I didn't use the magnum primers like the load data had called for.
I had already backed off with the 10% load data listed as the start load.
Is there anything I need to be worried about?
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Old 09-02-2007, 22:09   #2
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The worse that could happen is not all your powder would burn. No big deal. What kind of powder did you use? Unless a real slow burning powder, like H110 or 2400, I have never been able to tell a nickles worth of difference between magnum and regular primers. And even magnum primers will not completely burn 2400.
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Old 09-03-2007, 05:10   #3
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Titegroup.

The only other flub I've made so far is priming 50 unsized cases by mistake. Doh!
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Old 09-04-2007, 06:32   #4
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I'm not familiar with Titegroup, but I am familiar with Bullseye and that is what I use in .38, .357, and 9mm. I loaded some 357 with the same powder charge using CCI 500(std) and CCI 550(mag) primers recently to see what the difference would be, and it was noticeable. Not terribly so, but you could tell the difference. If you are using a slower powder, a mag primer could be just the ticket to burn all the powder, unless you have a real short barrel, then not much will help.
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Old 09-05-2007, 01:05   #5
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I find using magnum primers on my 357 mag loads unnecessary, unless im using H110 or 2400. your loads will be fine you may actually find that combination to be very accurate
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Old 09-06-2007, 18:52   #6
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When I started out reloading and wanted to graduate from .38 and .44 spl to .357 and .44 mag, I was told that if you use Magnum type powders it's best to go with the magnum primers to insure better burning (as stated above). Also, there was some caution that they may be necessary in colder temps with those powders for the same reason.

With the marginal diff in cost and the better assurance they'll work like they're supposed to, I always use the mag primers with the mag powders.
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Old 09-08-2007, 10:52   #7
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I read an article one time on primers, and they measured the burning length and temp of the primers. From what i remember, the magnum primers burned for a longer duration at a lower temperature. So if you sub a magnum primer for a standard primer, and if the standard primer was getting all the powder combusted before the bullet left the barrel, then you'll get a lower velocity with the magnum primer.

So it really depends on your situation and whats going on in the chamber/barrel. I just use the primer called for by my reloading data...I can't tell much difference one way or the other on the chronograph.
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Old 10-10-2007, 14:46   #8
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Skeeter Skelton wrote an article back in the 80's about his favorite loads for the .357. In the article he showed that standard primers actually work better with his favorite loads. More consistent results.

I use H110/W296 exclusively in my pistol magnum loads and while I use Winchester WLP for standard or magnum in the large pistol, I use WSP standard primers for all my .357 loads.

I get no noticeable unburned powder and uniform results. One ragged hole in the target.

Use standard primers without concern, they work very well indeed in small pistol applications.
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Old 10-11-2007, 19:42   #9
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They all seemed to go bang...no unburned powder.
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Old 10-12-2007, 02:00   #10
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generally flake powder uses std. primers to avoid pressure 'spikes'. ball or spherical powder uses mag. primers. some of the slow 'flake' powders may use mag primers. selection is somewhat dependent on the crimp used also. most all taper crimp cartridges use the std.
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Old 04-26-2011, 08:08   #11
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I use Unique and have used both magnum and normal primers and as long as I dont undercharge I cant tell any difference between the two.
If the charge is a bit less than optimal then I get a lot of powder flakes that didnt burn that end up all over the place. Seems like if the charge is on the lower end the magnum primer 'may' give a little more pressure or something and help the powder burn a little better, but if I have at least 4 gr of Unique then both primer types seem to be about the same. Havent noticed any difference at all
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Old 05-29-2011, 15:42   #12
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I started using Ramshot Enforcer for some of my magnum loads (.357, .44 Mag and .454 Casull) and found that small rifle magnum primers will not always burn it well in the .454's without a monster crimp. It's a pretty slow powder and you need to be sure of your primers when using it.

I'll have to see if somebody makes a really hot SMR primer. I undserstand they are not all the same.
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Old 05-30-2011, 17:56   #13
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I've interchanged regular and mag primers in 38 and 9mm back during the great primer shortage and the only difference was 30 FPS on the chrony
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