How much H335 behind 123 gr SST?

[603 Country]

I believe I now have the info I needed. Thanks. I’m thinking Bonas’s load is about what I’ll wind up with. I wanted 2400 fps approx, and I don’t have a chrono, so this load range will give me about what I’m after. And, the guy that sold me the upper said that it was a fast barrel. All good.

And I have just the pig to try the new load on, when I have the new load.