4- bore is 1052. So no, it is not. A 4 uses a 1750 grain ball,a 6 uses a 1167 grain ball.Still enough, for a most determined rabbit charge.
-------------------- I find it difficult to accomodate myself to the stuffiness and constraint of a modern city: I prefer the Pori (forest) to the imprisonment of streets,the twinkling stars to lamps,the sigh of the primeval forest to the tramp of thousands of feet. James Sutherland 1912