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Some have recorded those primers to be a little hotter then the US primers are. That could be case. It might allow the powder to burn better in some cases. The only way to tell is to load up a bigger batch and try them to see if the pattern continues. Many have said when you change a component you should always work the round up again to try to compensate for any changes there might be. It is also possible you didn't fully work up your load using Winchester primers before and just needed another 0.1 of a grain of powder to make it more accurate in the past.
If you load up another batch of ammo and it works just as well for you, I suggest you grab a bunch of those primers for future loading.
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