I used 150gr's of Pyro Pellets ever since they came out with (Magnum) MLers. Never had a Problem. Sure there was a-lot more Kick and I did lose some accuracy but it worked and everyone knew when I shot as the sound was unmistakable.
BUT, I grew out of the Magnum Charge 2 years ago and switched to 110gr's of Pyro Powder and 100grs of Pyro Pellets in one of My other MLers. I gained Accuracy and no more Black and Blue (Arm Pit Shoulder Area's)
Sighting in was the Worst part of 150gr's especially with a New Scope, by the time I shot about 10 shots I Cringed at the next shot, it Hurt! and Im a Big Guy, 6'5" 240.
I always thought Bigger was Better but I learned a lesson and I never lost anyhing by going with Less Powder. I can shoot just as Far but be Much More Accurate. There's No Need for 150.
(BP)