With Sig's 1-10" twist rate I found that my X5 preferred 124gr and heavier bullets. The gun was stellar with a 124gr and 147gr Montana Gold FMJ's and Unique. Not that results with 115gr bullets were anything to scoff at.
Your best accuracy, when speed of the bullet arriving on target is going to be the 147 gr with it's longer bearing surface. The most accurate factory round I've shot in this weight is the 147gr JHP Super Match Sub-Sonic.
The most accurate SIG X-5 Allaround at this years Bianchi Cup was shooting 122gr Laser cast slugs loaded to about 1000fps to reduce the lead needed on the Mover
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