Anyone Here with Experience with Vihtavuori N568?

I'd be interested in knowing how Vihtavuori N568 performs, particularly in the .243 Win., 6.5x55, and .270 Win. It doesn't appear on the burn rate charts I've seen, nor is it included in my version of QuickLoad. Can we assume that its burn rate lies between those of VV N565 and VV N570, as its number would seem to indicate? Vihtavuori powders are pretty widely available in Canada now. I have N560, and it seems to be an excellent choice in the cartridges mentioned above, but I'd like to look into N568.
 
Vihtavuori say it specifically for heavy for calibre bullets out of high capacity cases, and only lists data for magnums with the one exception of 6.5x284.

That would suggest to me it’s too slow for normal capacity cases and bullets, I’d stick with the N560 or go a bit faster at N550 depending on bullet weight.
 
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