My best load in my BRNO 30/06 used H205 and drove a 180 at 2860. It shot under 3/4 for five shot groups, pressure seemed fine, and this lasted until I couldn't get 205 anymore! From then on, I stuck with my old 4350 load which was fifty fps slower but shot just as well.
I built a few rifles in 30 Gibbs and most ended up shooting 180's at around 2800. Most, soon enough, realized, if you want a 300 mag, the best way to achieve that was to have a 300 Mag. GD