That's a pretty nice group for the 90gr Sierra HPs in your .270.
I have used that bullet in the past in my dad's Rem700 .270 when I took it along as a backup on a prairie poodle hunt a few years back. if I remember, I was getting about 1.25"-1.5" groups at 100yds pushing the bullet with IMR4064. I never did a lot of tweaking on the load though since it was just a backup rifle.
Dad has used that load as coyote medicine a few times as well...it's not the hot ticket for hide hunting since it did a good job of peeling one dog darn near inside-out.
But dad's not in it for the hides anyway, he's just keeping the yotes away from the cattle.