you need a bigger bullet when you use copper bullets example a 168 is how big you need to get the equevelent of a 150 and I can tell you speed it NOT what you need you need accuracy and energy both of which a 168 ir way better that a 150 in 308 history 168 and 308 are like peanut butter and jelly . I have many one shot elk kills dropped in their tracks at ranges over 300 yards and I get the accuracy of less than 3/4 of a inch at 100 yards can your 150's do that? just buy a box of the barnes 168 TTSX 20 hunting rounds will last you years!
For those looking into going long don't forget to get enough dial up for the distance you plan to try, we saw this last year many tried the 2905 but could not dial up to try it and Kentucky windage ain't cutting it at those distances... if you need help just holler out here but get prepared this year will be EPIC........
I have had one for over 14 years killed a bunch of elk deer and other critters with it . It is still amazing accurate for a gas gun as many here can attest to I also have a 6.5 creedmoor barrel and upper for it and it is just as accurate as the 16 inch 308 upper a fine fine weapon system.
when playing live gigs that are a hour and a half long I would loose 10 lbs in sweat a nite when you hydrate you get it back but it is a heck of a workout..... and it depends on the music you play as to how much of a workout it is...