BEFORE using a Reamer (ANY BRAND), I would measure it carefully with an accurate Caliper to make SURE it is indeed the correct size. If it is the correct size and metal is being removed from the Charge Holes than they were obviously too tight! There is no other explanation I can think of that makes sense. If someone states that their Manson Reamer just drops in than I would either suspect that their Charge Holes ARE the correct size OR the particular Reamer they received is NOT the correct size. Easy enough to find out just by measuring with a Caliper. Seems simple to me.