No pressure signs with the 150 screaming along. Not sure if you read the story on RL-17 from 6mmBR.com. They were reporting close to a 200 fps improvement with certain cases over all other powders. The 284 is one of those cases.
Alliant Reloder 17
I worked past 58 grs and actually shot 58 grs over four sessions. Never had any signs of pressure in this rifle. I backed down to 57 grs for accuracy. Please note the OAL is longer than the SAMMI 284 and I used Moly. Not sure if it matters...the barrel has approx 800 rounds through it.
It hit me last night the 284 win is 46 years old!