They were a nice rifle, made from about 1967 through to the eighties, prior to Tikkakoski being absorbed by Sako. Forged steel receiver, lapped and free-floated barrel and an adjustable trigger were features, and they did have an excellent reputation for accuracy.
FWIW Australian and British SAS used the heavy-barrel Sporter, in .22/250, as an urban/counter terrorism sniper rifle in about the late 70s- 80s.
