I have a 1x8 so I don't have first hand experiences with a 1x10 but I would say that stabilizing a 200 grain BTHP in a 1x10 twist at SS velocities is not guranteed or even expected.
You obviously proved that point with that barrel and bullet combo at least.
I would double check those 190 SMKs to make sure they are definately stabalized before running more through a can.
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