I have never liked Remmington ammo, except 22LR. I have shot them all out of my 270. For your requirements I would suggest Federal Premium 150 gr. parts, Winchester 140 gr. Failsafe or Hornady 150Gr interlock. Federal and Hornady have always yeilded my best groups out of all my guns for factory ammo. I have taken 1 moose and 2 elk with failsafes, they worked well but only managed around 1 3/4" groups with them, the federal nosler parts grouped over 2" (But that was my gun not yours).

I would say if the 150 Gr bullets you used from Rem were parts, then go with the Federals. Don't be suprised what ever you choose or do if you need to fine tune, I have yet to shoot different rounds out of any of my rifles that stayed bang on from different manufacturer's, even with the same gr. and bullet style.