I recently bought a Rossi reproduction of the Winchester Model 92 lever action rifle, this 454 Casull being made in 2004. Futzing with it I noticed that when I ease the lever down to take its locking lugs from battery, the breech bolt jumps toward the rear. When I ease the locking lugs into battery, the bolt moves foward to lock the breech bolt in battery.

When I observe this fore-and-aft movement in bolt actions, it is primary extraction and camming the bolt locked. But I have been informed over the decades that traditional lever actions do not have primary extraction. I know my Marlin 1895 does not have this movement.

Is the movement, seemingly caused by relationship of locking lugs and their lug seats on the breech bolt, primary extraction? If it is not, why does breech bolt spring backwards and appear to be cammed forward?

There is no cam on these except for the lever slot that the bolts are affixed to. What you are seeing is the ejector making the bolt jump rearward; this is not any sort of camming or extraction assist. Don't worry about; shoot it. This is a simple design where the lever is pinned to the bolt and the lugs are pinned into the lever.