Yes,Remington designed the round, and it can be fired in any good quality gun chambered for 22-250. Just as 300 Winchester Magnum was designed by Win, but any make of 300 Win Mag ammo can be fired in any good firearm designed for 300 Win Mag.
early 60s or so
No English sn data published
Impossible to answer without the sn.
early 60s or so
The L579 was a model number that was used by Sako.it describes the action type.The info that you provided will not indicate what caliber that you have.Your Sako rifle should be marked as to what caliber your rifle is chambered for,somewhere on the firearm itself.
1/10
100-1000 USD depending on specifics
@ 28 years old
AROUND 1986
@ late 70s
100-1000 USD or more depending on specifics
Value is anywere for 900$-1800 depending on condition