I'm quessing your seeing about as good as it gets. The barrel was most likely cleaned from the muzzle and after nearly 100yrs it is worn a little from the cleaning rod.

It wasn't that long ago that a 1" rifle was something to brag about. My 250-3000 would open to 6" with 100gr FB bullets and shot it's best 2" with 75gr FB bullets . 87 gr Hotcors ran around 3" but that was fine for deer and called coyotes.