Savage does make a 20" how ever it is not their tac model, I beleive the model you are refering to is the Mod 10FM, it is listed under ultra light on Savages web sight, right below the Savage Scout.
The mod 10FM with it's 20" barrel would be a good budget, short .308 platform for a shooter trying to add a urban tac sniper to his collection, but was unable to spring the $700+ bucks on a Remington 700LTR.
Despite what many will tell you about Savage, rest assured that your Savage is probably more accurate than you are.
I would drop it in a different stock and maybe go with Trijicon's 3x9 tritium illuminated scope, a set of butler creek scope covers and your in business.
For about what it would cost you to buy the base Remmy LTR.
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Fearandloathing37 Building Tactical horrors on a budget since 1981