Unless they changed it in the past few years, the earlier ones (I got mine in 2005), it's a 6.05mm. Still, dry swabbing is crucial every 20 shots, you'll see the accuracy and consistancy go to shit after two mags. I used to shoot mine a lot in my basement (30ft) and could get BBs into a dime sized hole for a couple mags, then it started to spread out. I ran a dry swab through and the dime sixed groups returned. Heck, when my daughter was 7 years old, she liked to shoot bottle caps at that range with my 700. So, nutshell, it's a semi tightbore unless KJW changed barrel manufacturers.
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