I have three m146s . One had already been chambered to x62. None are drilled and tapped, just original, cept one other had a bad stock so i duplicated one of the good stocks to a nice english walnut blank and put a red pad on it, finished it with Dalys and alkynet root stain. Love those 146s ! Im shootin 47gr imr 4895 with 285 gr bullets and necked up ww 8mm brass