did my l61 r chambered for 300 wby.. it brings the surface hardness to rockwell 70 and the action feels like it is on ball barings gives the metal a really coal black matt finish, looks really nice. warning only do new barrels of known steel quality. and dont do a gun that has been fired. my sako shoots a 200 gr ab at 3050 with 24 inch barrel and under max load. and ragged little holes. i have only used it last season on a 10 day moose hunt in bc. the finish held up really well, still looks new
