Notwithstanding original 1,325fps black powder loads between 1873 and 1877...and 1,300fps smokeless loads from 1895....
Full Power- should be a load that produces at least 1,245fps from a 26" barrel with a 200gr projectile, which is not suggestive if using original published BP velocities from 1886 to 1904. Some may even say, and rightfully so, that Full Power loads should be at least 1,325fps for black powder charges and 1,300fps for smokeless powder charges.
Case Capacity - should be a suggestive load simply referring to a full case of powder where the bullet sits "firmly" on top of the powder, regardless of velocity, and is suggestive since the capacity can be fulfilled by different weights of the same black powder, i.e. compressed or not compressed.
examples:
While a 35gr or 37gr charge of a black powder (no powder compression) may be a case capacity load, it may or may not not be a full powder load.
While a 9gr charge of Unique is not a case capacity charge, it is certainly a full power load since it can produce over 1,245fps (1,305fps from a 26" barrel).
40gr of a compressed black powder is not a full power load if it only produces 1,200fps from a 26" barrel.
38gr of black powder is not a full power load if it does not produce at least 1,245fps from a 26" barrel.
In 1925, Winchester World Standard Guns and Ammunition lists the rifle velocity for the 44-40 smokeless standard loads to be 1,300fps with a trajectory of 3.2" @ 100 yards, 15.9" @ 200 yards and 42.3" @ 300 yards. Revolver loads, black powder lead, smokeless powder full patch or soft point, produced 920fps.
John Kort's test chart