Id say the .690 ... most paintballs will do well in that bore size.

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Setup:
Olive Green A5 with Super RT.
Flatline/Spec ops C-series with Apex
LPK (soon) with Palmers stab. Stab is mounted on Lapco Offset rail. Library M4 Collapsible stock

Stock Invert Mini with Spec ops C-series w/ Apex