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Old 08-15-2010, 17:58   #1
Glockin26
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CCI 350 magnums for 10mm?

I ordered some magnum primers because my brother didn't want wolf primers for his virgin G29. On any given load how much should i reduce the powder from max. Any help will be appreciated.
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Old 08-16-2010, 17:49   #2
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If you are shooting a stock barrel, I would start at 12% below max at least and work your way up in 2-3 grain increments. If it's what I experienced, you won't make it to max before your brass starts smiling at you.

This is the reason I use an aftermarket barrel now.
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Old 08-18-2010, 19:11   #3
_The_Shadow
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Glockin26, I have subsituted the 350's directly on some of my loads without issues but have seen some where the pressure is more.

During some of my testing, I found Alliant Power Pistol's burn rate to be better suited for the shorter barrel. One of my loads I liked was 8.0grains under the Hornady 200XTP seated to 1.260", these when 1140 fps.

Best of luck!
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Old 08-19-2010, 21:50   #4
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The one powder that has presented noticeable pressure issues for me, with 350 primers, is 800-X. I've encountered pressure symptoms well below levels were fine with normal primers, and well below published max data. If you are using published load data, starting at beginning loads should be just fine though.
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Old 08-26-2010, 14:23   #5
Burien
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Wolf LP are all I use in my g-29 $18 a thousand at Wiedners last week, function every time.
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Old 08-26-2010, 20:44   #6
MakeMineA10mm
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In the 10mm mag primers are really unnecessary. They cause more problems than they're worth. The slowest, hardest-to-ignite powder in the 10mm is AA#9, and I find that the Winchester LP (which are about half-way between standard and magnum primers) are plenty for that powder in the 10mm case (which is not that large...).

In exchange for the magnum primers, you'll get a lot more pressure, when with most powders, you're able to load to the max pressure already. Also, ignition is almost never an issue. (10mm case isn't that large.) So, it's really more trouble than it's worth. As noted by Kegs above, you'll get pressure signs before you get to max loads.
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