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AR15.COM
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5/19/2009 1:38:39 PM EDT
Does a 10 mm use large pistol primers or small pistol primers?
5/19/2009 1:41:49 PM EDT
[#1]
Large
5/19/2009 1:44:33 PM EDT
[#2]
If you have a load manual handy, take a look in there.

Online load data sources also specify the primer.

5/19/2009 1:46:50 PM EDT
[#3]
Thanks guys!
5/19/2009 4:54:29 PM EDT
[#4]
large
5/19/2009 10:29:59 PM EDT
[#5]
Annnnnnndddd...some powders call for a LP Magnum, such as AA#9.



5/20/2009 12:27:42 AM EDT
[#6]
And Power Pistol.



In fact McNett of Double Tap recommends working up all 10mm loads with magnum primers to ensure complete ignition.
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