I believe it is a controlled feed. The P-14 Enfield had a very similar extractor, and it was definitely a controlled feed. As the owner of several Newton rifles, I can only hope that the pictured rifle is heavier than it looks. I would not want to shooting anything of a .458 Lott's recoil energy in a rifle as light as the 1916 Newton bolt rifle. Even the .30 Newtons were notorious for splitting the stocks because of the recoil. My .30 Newton has a split directly behind the recoil lug.

Also, I would be curious as to how the recoil lug of the leverbolt action is designed. The Original Newton rifle had a conventional recoil lug located similar to that of a Mauser. The post World War I so called "Buffalo" Newton had no recoil lug at all, but instead relied on a steel recoil plate pernmanently bedded into the stock which fitted into a latitudinal keyway behind the magazine of the action. Since there are reinforcing bolts in two places in the leverbolt stock, with the front one evidently larger, I assume the recoil lug is conventionally located.