Here's the description from SIR mailorder. Of course they don't tell you the twist of the barrel.
Ruger® K-77 RP Ruger Stainless. MK II Rifle (.223 Rem)
The Ruger M-77 Rifle offers the sportsman excellent performance and reliability while preserving the form and balance of the classic bolt-action design. For strength, the barrel, receiver and bolt are made from heat-treated chrome-moly steel. Two massive front locking lugs and a positive long extractor, combined with one-piece bolt construction, result in extraordinary strength and reliability. The safety is located on the tang and readily accessible. The floorplate is easily opened for unloading by pressing the release lever located inside the front of the trigger guard, the barrel/action assembly of the M-77 Rifle is precisely fitted to the stock. Scope mount bases are integral with receiver.
K-77 RP Ruger Stainless. MK II Rifle With Ruger Integral bases and 1" scope rings. (No sights). Black Zytel stock. Weight: 7 lbs. Barrel: 22".