Pretty sure they are a 10-twist, but get your cleaning rod out and measure for yourself.
The SST's will happily stabilize with a standard 10-twist, as will 99% of the 100gr. Just stay away from the VERY long match bullets.
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
Look up the lengths from this link, then fill out the details and it will let you know if there is any hope of stabilizing.
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