I can't vouch for the Sako, but the Tikka will shoot well under an inch. I have a Tikka Whitetail Hunter in 308 win. and with handloaded nosler partitions, it will shoot .5 to .75 inch groups. I can only imagine the groups that I would get if I used a match bullet. The Tikka and the Sako barrels apparantly are made in the same factory, so the quality is the same for both rifles. Also the action is so smooth, if the Tikka is this good, the Sako must glide like it is on ice. Don't worry about the accuracy garuntee, the gun will definitly shoot. enjoy your new toy!!