Brush gun= FICTION! The only advantage of the "so called, brush gun" lies in the gun itself, not the caliber! That advantage would be a short, lever gun in tight cover. This "advantage" which is ever so slight is negated by the limits of most lever-gun calibers, usually, "the tried-n-true thuthy-thuthy!" While I am not a big fan of the .270 (just personal preference) there are literally dozens of calibers that put the 30-30 to SHAME! ANY one of these calibers will at least equal the 30-30 at tight range and far out shine the 30-30 if the shot becomes longer.