Never experienced it myself but have heard of a few and seen a couple of Tikkas with the old factory alloy rings move around, all in long action or magnum. Also seen an older European (cz I think) with cheap shit alloy rings move. Air rifles are notorious for it and need some sort of pin/lug.
Personally I don't like straight dovetails without a pin/lug, just seems like there's a fair chance that it will slide eventually. Rimfires I'm not so worried about but if there's not much extra effort I'll do something other than dovetails.
Tapered dovetails such as Sako I've never heard of issues, could be the dovetails themselves could be usually the rings are better.
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