Ho Perfesser Marvelous
Nope. Never heard of nor read about anyone pulling the stuff from the front end of a lever Rifle to test for inherent accuracy.
I will postalize though. Since I once was foolish enough to dabble in "Bench Rest." All of us Loons free floated barrels and increased the diameter to stupid proportions, to eliminate harmonics (vibration) and expansion variations, and including holding yer tongue just right. All in the interest of shooting little itty bitty groupies. All of that contributed to startling accuracy. Especially holding yer tongue just right. However we all found a 45 pound rifle some difficult to lug around. SO:
I think (WAG Here) stripping a Lever Rifle or Carabiner down to receiver and shooting from sand baggage might show an increase in accuracy. Measurable but basically academic. Achieving an inch smaller groupie at 150 yards, when what you need is "Minute of Moose" is kind of . . . "Ho Humm." Minute of Man same same as long as putting the sights on the Belt Buckle results is a center of mass hit, your gold.
Play Safe Out There - People are still Hazardous to Yer Health
PSS: Trying to achieve Target Rifle accuracy with a Lever Rifle is Ozymoron. No, I am NOT opinionated.
PSSS: I shoot Henry Rifles almost exclusively. Since they have no "stuff" to remove from the barrel, and the barrel is heavier (stiffe) I too think they shoot more accurately from a rest. Standing on yer hind legs not so much (sucker is Heavy).