Willie the only thing I'd add to what my learned colleagues have said (as excellent starting points) is don't overlook the value of strengthening the fore-end as part of your bedding activities. The other would be to check the crown for any wee dags that might be there at the end of the rifling, if there are its relatively easy to get removed or polished out.
Remington and even my T3 that i thought was free floating when sitting in my gun vise was touching the barrel in one place when I'd place weight on the Harris Bi-pod firing prone. Sweet as off the bags but both the Remington SPS ( Theres a reason its called SPS) and T3 Lite stocks tend to have a possibility of torquing and touching the barrel when fired if you use one of those or apply any pressure that may influence the free floating nature of the barrel and the ability for the lug to float during the shot and return to battery.
Nathan Foster has a compound for that too - It adds weight but this might be the thing that changes your POI for the group by as much as .5 MOA.
I'd also check or get Arthur to check for slop in the action and see whether a true up may be warranted. Its a line call but now wer're getting into long range tweaks and to the point where there will be diminishing returns for cost versus accuracy gain.
Just my 2c.
P.
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