Different ammo can cause a shift in POI. It's more obvious with AccuBonds and mono's but powder changes can do it too. Hard tellin not knowin. Might be one of those circumstances of pick a bullet and sight in and leave it alone.
YUP,. THIS ^^^ Stay with,.. ONE accurate, Bullet !
KNOW, your Rifle and Load !
I'd prefer, the 150's, in a Standard .270 Win as, they WILL,.. Hit harder, Buck Wind better and Penetrate,.. DEEPER !
Keep, the Rem Brass but,.. shoot the Factory 130's up at,.. Rocks ( BIG, Rocks ! ).
I shot some, Rem 130's in my .270 WSM, Tikka and they grouped about, 1.25+ inches in Dia. and 4 to 5 inches OFF at, 100 yds in, a Sub, 1/2 MOA Rifle, using 140 gr. Classic Hunter, Berger's ! The Rem Coreloks are, Flat Based, the 140's have, a NICE Boat Tail !