I am most grateful for your following along & adding info.... I will probably use a Magnum Primer when I get closer to a load.
What is your opinion on using VV N140??
I know what I know. But more important is that I should know what I don't know, free after Socrates. ;-)
In the given case [pun intended !!], a slow but not overly slow propellant (keeping in the mind the warning against the very progressive R905), such like the VV 140 might appear as suitable in principle. Might. And VV were are very popular here, more than RWS. Though Swiss RS now have gained much popularity.
However, I know of few propellants whose characteristics and parameters have been reported to have changed SO MUCH in a comparatively short time as VV 140, in a period of maybe 25 years. It was almost notorious for that in Germany, as I think to recall.
Here, this may also be of interest to you. Using HDB bullets (much better for the speed) and powder data with Hodgdon H1000. The primer is a Magnum one, too. I have not tooooo much esteem for Lüderitz, but he had apparently these data tested by the proof office, getting to 980 m/sec as V-0:
https://forum.wildundhund.de/threads/5-6x61-r-se-vom-hofe.79448/Carcano
