Second hand and unknown round count yet another variable, you say the barrel is pretty tidy but is this your opinion from looking down it with a torch or have you had it inspected with a bore scope ?
What ammo or load was the previous owner using and what kind of accuracy where they getting ?
Are you using the same optics as the previous owner ?
Is your mate that shot it a reasonably proficient shooter ? Can he achieve consistent groups with another rifle without getting fliers ?
Your mate that does a bit of reloading, no offense but how experienced is he ? Does he get good results with other rifles ? Just cause someone does a lot of reloading doesn't mean they are good at it (no offense intended it's just another unknown variable at this stage). It is one thing to be given a recipe and then just duplicate it, its a whole lot different can of worms and a lot more experience and knowledge is required to develop your own recipe and know what to look for when trying to develop a load
As much as I don't like sst's I've not really heard of anyone having trouble getting them to shoot, in fact the opposite is true and one of the reasons why they are so popular is that they are easy to get accuracy out of them.
You say you have been tutuing with it have you had the action and barrel out of the stock ? Did you torque it back up to sako specs ?
Are the sope rings and bases torqued to spec ?
Have you tried your scope and rings on another rifle or vice versa another known good scope and rings on your rifle.
As Mimms2 has said if you were closer I would help, surely someone from here is up your way and can help.
I know some of my questions might seem like I'm having a go, but rest assured this is not the case there are just so many variables that are unknown, getting consistent performance out of reloads and accuracy out of a rifle is all about removing the variables and getting everything as consistent as possible.
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