^^^ yeah that.
It's a case of the Microgrooving being persnickety about what ammo it likes,
as each barrel seems to like something different than another one.
That's why a lotta folks with Marlins are used to having Log Books that
notate what rounds work best for the most precision.
That's why most Marlin owners have only ONE centerfire rifle of each caliber...
so we don't confuse the ammo's
I keep a short listing on top of the ammo bag for my rimfires as well...most prefer CCI Minimags in .22lr,
but others prefer Remington Target Standard Velocity...