Brian
You can define the default issue type on the issue type scheme that is used by your project. Just edit the issue type scheme and select the default one on the drop down list as per image below.
Screen Shot 2014-11-11 at 7.01.31 PM.png
For more information on this matter, please refer our documentation below.
https://confluence.atlassian.com/display/JIRA/Associating+Issue+Types+with+Projects
Hope it helps!
Cheers
L.F
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