SMKs normally like to be off the lands so I'd try loads set about .010" OTL. I don't have experience with the Hornady's so don't know if the like to be jammed or jumped. You didn't mention what kind of accuracy you've been getting, brass used and whether it's fully prepped and weighed so it hard to judge what course of action to take. Are you chronographing loads? I would try the CCI BR-2 primer instead of 200s, they may help tighten up groups. Varget is a good powder that normally works well in the 308.