I had my Remington 700 cut with a 308 match reamer but needed a little more throat to accomodate the range of bullets I planned to use. By a little bit more I mean increasing the depth by 0.010. Purchased the subject throating reamer, followed the easy instructions, and successfully increased the depth the desired amount. A trip to the range confirmed no degredation in accuracy. The gun still shoots in the .4s for 10 shot groups. I highly recommend the tool...