I've not got the answer to your question, as I too have been thinking it would be nice to use Vihtavuori.

I do note that Viht 110 is similar in speed to H4198, but I have no experience of it.

I currently use Lovex D060 (previously Accurate 5744), which is a fraction slower than H4198, in a Rugger No1 for both plinking (405 lead 20-25gns), and full loads (300 jacketed 35gns).

I hope you find your Vihtavuori load.