Those Interarms actions are smooth as butter. I've owned several Mark X in various small calibers. They always seem to go to better homes as I have none currently. One thing about them...I've found they benefit from just a tad of pressure at the forend tip against the barrel. For me anyway they didn't seem to like free floating, but they were rather thin barrels...yours appears heavier, likely due to caliber. And shorter is good too to minimize barrel whip....I have an awesome barrel whip video that'll blow you mind just how much barrels flex while firing(if I can figure how to put it on youtube...never done that before but if a 10yr old can do it well...). I did the ladder method years ago to develop a load for a Rem 700 in 7mm. The difference between firing at an accuracy "node" vs not was 1.5" groups to holes touching. Only diff was powder weight(ie velocity).