Since last we spoke I bought more powder, but they were out of my usual and I got something different.

Quelle Horreur!

I have gone from Vectan BA9 (tiny grains) to Vectan A1 (big flakes). The shop assured me this burns cleaner and suggested just 3.7gr behind the 124g FMJ. This corresponds with near the upper limit of what the chart says, which is what I used with the BA9 also.

I loaded ten to try tomorrow, I have a new brass catcher to test too, so two birds and all that.