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Rest assured I'm not trying to compete with you on number of sakos owned :D
I wasn't suggesting he looked at the bore himself with a borescope I was questioning where he got his information about...

I had great success with the eldx in my 270wsm and they were pretty easy to develop a load with not too fussy on jump although with a 75 you should be able to seat them right out and get some great...

Definitely on the slow side, I'd be trying adi 2225 or retumbo which is the same powder under a different label.
Also I'd be trying pretty much anything but sst's
145gn eldx
150gn berger vldh ...

Dunno about over thinking, he asked about getting tighter groups so the advice given has been directed at just this, being a sako 75 which come with a 5 shot moa garuntee I'd be very supprised if it...

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 load are you using ? What sort of speed are you getting ?
Is it a new rifle ? Has it had many rounds down the barrel ? Could copper fouling be the issue ? Have you had someone else try shooting...