We're attempting to import approximately 10,900 Joomla Articles in 2.5 to K2, but the process fails with a 500 error (I assume it's got something to do with the size of the import, but can't identify the exact cause.) Is there a more reliable way to bring in these content items?

I would take a look at this extension at the bottom of the page k2importcsv
www.individual-it.net/en/Joomla/

Also take a look at his posts here, as i think i remember him addressing the large imports
getk2.org/community/profile/userid-972

Thanks for the links William, I looked through them but it looks like those apply to importing from K2 to K2, where we need to import from standard Joomla content to K2 content.

We managed to convert all our content by:

• a. Exporting our Joomla 'content' table into several chunks
• b. Emptying 'content'
• c. Importing a chunk
• d. Running K2 import

Then repeating b-d until all the chunks had been imported.
I feel there was probably a better way to do this, and we had to split it into 6 chunks (about ~1800 records each) to successfully import, but it worked well enough.