[sheepherder]

You didn't mention in your profile where you live, so I don't know if you have the same shortages of powder etc as we do here in the US, but I am actively looking for W231 as I have used it in the past for 9mm and plan to try it in my 7.65 reloads.

What I do is compare 9mm and 7.65 loads using the same bullet and powder other than W231. I note the min powder charge in the 9mm compared to the other powder and adjust my W231 7.65 min load accordingly.

Sounds confusing but works out fairly well. I only load 5 rds to start, so if I'm over or way under, I can break them down and start over. Or just fire them off in something else [Lahti, Star].

Unfortunately there is no hard and fast 'universal' load. All firearms have a 'sweet spot' that only experimentation of powder, charge, and bullet will reveal. I've been looking for years...Still looking...