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Can you give some details on how you know your reloads arent hot? You may have overlooked something? Dumped powder from a measure back into the wrong container? Old powder? Scale needs calibrating (weigh a projectile).
A projectile jammed tight into the lands can raise pressure - an old Sako could have a very short throat compared to a modern Rem etc. That combined with a tight chamber + thick brass could make a "max book load" well over max for that rifle.
If your loaded rounds chamber and eject normally before firing then I would try firing a round with an absolute minimum charge from a new supply with the projectile seated well back from the lands and see if the problem goes away - work forwards from that point.
Always interesting to see how a problem resolves - please post any solution you find?
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