The last 7x57 I had built was with a Pacific Tool & Gauge reamer that had a "target" throat, shorter than most. I would tend to go with something like that.
X2 ....... The throat is much shorter than the std configuration to the point of being too short for 175gr RNs. Most won't be using this bullet so no big deal but a nice bonus for most lighter bullets including the 160gr NP which I used for moose hunting last year.
