You must understand that the Ruger carbine is much like the 30 carbine in that you have a smallish window as far as pressure and pressure curve is concerned that is required to operate it properly.
Quoting from Speer #12 pg. 396 par. 4: The gas operated action of the Ruger needs full power loads to cycle the action reliably. Lever guns can be used with somewhat lighter loads, but we recommend that you not go below minimum loads shown when firing jacketed bullets. Lead bullets should not be used in the Ruger semi-auto because lead fouling can clog the gas system.
Although you did not specify bullet weight; Speer #12 tells me that 12.4 gr. of Unique is a max. load for a 200 gr. JHP. It is not listed in my Hornady or Nosler books for any bullet weight.
You are looking to use W296 which is a good choice. If you don't have it and can't find it my suggestion is to use a powder with a burn rate like : AA#9, 2400, IMR / H4227, 410 / 4100, 1680.