Magnums were stated to be heavier. The barrel contour on these are "Proof Light Sendero."
"Savage® teamed up with PROOF Research® once again to craft a barrel specific for a purpose driven firearm. At 6 pounds and under, the 110 Ultralite is designed to combat elevation and elements while maintaining the performance of a factory blueprinted Savage 110 action."
Specs for a 28 Nosler say exactly 6lbs.
The profile is much smaller than a "Sendero Light." A "Sendero Light" is .820" @ 24". I have the 28 Nosler at my house. It is only .743" at the thread cap.
I can't find a barrel on Proofs site that comes anywhere close to matching this profile (Except for the Bull Sporter profile in the all stainless barrel section). The carbon wrapped barrels are all much heavier profile. Even the Savage Prefit barrels have a larger muzzle diameter.
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110 Ultralite for Backcountry Hunting | Savage Arms
The 110 Ultralite is designed for elevation and elements with a lightweight PROOF Research carbon fiber barrel. It's the ultimate backcountry hunting rifle.
www.savagearms.com