About 2 years ago I used a then-current batch of H4831SC, 61.5g of it with a 150g SST. It was so compressed it pushed the bullet out a little overnight.
Compared to many manuals I thought the velocity was very mild. 2990fps from the 23.5" bbl.
When I mention manuals, I mean that I don't remember ever seeing a 61+g load of that powder with a 150g bullet.
I worked up to the load gradually of course. Lighter powder charges had been very underwhelming.
Bobnob: interesting because I have never seen that much H4831 recommended with a 150 gr bullet. The velocity is very good, too. Got a feeling lots of little things added up there...does the SST have short bearing surface maybe?
Other things to consider besides the powder are what kind of barrel was that? Were you throated on the long side? That's a barrel I would like to slug for groove diameter. A loose barrel and longsih throat can take heavier powder charges than a tighter barrel IME.
Little things we don't consider sometimes add up.
