Please explain how chamber throating depth is controlled when chambering a barrel.I'd like to rebarrel a 7x57 Mauser but don't want the traditional long throat. I'd like to keep it short enough for the 140-grain range of bullets. Thanks

quote:

Originally posted by dfielder:
Please explain how chamber throating depth is controlled when chambering a barrel.I'd like to rebarrel a 7x57 Mauser but don't want the traditional long throat. I'd like to keep it short enough for the 140-grain range of bullets. Thanks

Use a separate reamer. Cut the throat last.

this also means that you need to do the initial chamber reaming with a reamer that does not cut the throat.

So you need to say so to the supplier of your reamer...
OR you need to be willing to grind off the flutes in the throat area of the reamer.

AllanD

Almost all of my reamers are throatless. I prefer to do the throat as a separate operation. I like to be able to adjust the length of the throat based on individual needs. Kind of like the Burger King slogan, "have it your way"!

Malborg's approach is a good one. You can also have a reamer ground with the throat dimensions you want. I do this so that if I want another rifle in that chambering with the same throat it is easy to do. Also if I wear out
the throat area of a barrel it is easy to set it back and rechamber. The throat is a significant part of the chambering. I am glad you are paying attention to it.

Thank you. I always learn something of value on this site.