I'm in the same boat as you... I have a new-to-me savage 99 in .308... I thought 150's would be the ticket... So far I've only shot it once... with winchester powerpoints, tried both 150gr and 180gr. The 150's shot about an 8" pattern... the 180's shot about 1 1/2 " group.... So, if I was going hunting today, I'd be using the 180's... (and wouldn't fret about it)

I intend to reload for it anyway, and will try to get 150 gr interlocks to work... Point is, if you want 150's in factory fodder, you might wanna try a couple brands to see what your rifle likes best.

Ditto on the FMJ not being hunting ammo.... Here it is illegal to hunt with.... I'd think it'd not expand and pencil right through.

I've heard of some people pulling the bullets off mil-surp and seating a proper hunting bullet on it... but I think you'd get much better accuracy out of your own reloads or factory hunting ammo.