Can't say 150grs, but 180grs my .300win.mag. is quite stiff!

btw a .300win.mag. and 180gr bullets go together like PB&J!

I see no reason to shoot a bullet lighter than 180grs from a .300 win mag. almost all 180grs shoot just as flat and carry more energy than 150/165.

my advice, shoot 180grs and never look back.

compared to a .30-06 I'd say the 06 is a puppy dog compared to a .300 mag.