 Barrels tend to vary in diameter by minute amounts, and this variation can create a situation whereby the solid pilot reamer fits too loosely or too snugly in the bore.Another advantage of floating pilot reamers is that the pilot itself does not spin with the reamer, and therefore is less likely to damage the bore.The primary disadvantage of the floating point reamer is that the nose of the reamer must be cut down in diameter to accommodate the reamer pilot, resulting in a more delicate reamer.