I got a chance to order any VihtaVuori powder from Findland. By relative burning powder rate IMR 4198 is somerthing between VV #120 - #133. I spent several hours today in comparing IMR 4198 different loading data and VV #120-133 and I have to say these powders are very much alike.
Any thoughts or maybe experience in VV using in .450-.577 DRE?