Only way to know is to shoot it. If yours is like many ML's out there, you're accuracy will probably be a lot worse. If it were me, I'd forget about the 150 grain loads and work up a load in the 80-120 grain range, by 5 grain increments, that is the most accurate. Accuracy trumps raw power any day. At about 120 grains you reach the point of diminished returns, anyway.

Mike