I had forgotten what ammo I was shooting last year,and have some Core-Loc I took to the range a week ago.
I thought my scope must have been damaged and was loose,because I had shots all over the paper.
It hit me then that I was shooting the Federal,and loaded it.
Back to great groups again,out to 250yds.
Agree with you, it must be a gun to gun issue.
Remington makes good ammo.
One thing I did notice is that the Federal looks like it is better made. The way the bullet fits into the brass.
Can't expain it,but it just looks better all the way around.
Ever notice the difference?