October 25, 2012, 04:58 PM
So let's say somebody owned a 270 Win reamer but was really cheap. Could he turn a nylon bushing for the throat portion of the reamer and use it to headspace a short chambered barrel in a larger caliber based on the 30/06 case, like maybe a 30/06 or a 35 Whelen?
Seems plausible, but so do a lot of things that turn out badly.
October 25, 2012, 05:47 PM
Briefly, no. For one thing, the .270 shoulder is different from the .30-'06. For another, the neck and throat areas of a chamber are critical points and are also cut by the chambering reamer. They would not be properly cut by the small size of the .270 reamer at those points. Buy or rent a .30-'06 reamer and the necessary gauges.
October 25, 2012, 10:47 PM
What you describe is possible using interchangeable pilot reamers. It is common to have reamers that can be used for a "family" of calibers. The base reamer will be for the smallest bore in the family and others use larger pilots. You then use what is termed a combined neck and throat (N&T) reamer to cut the rest of the chamber. This must be very carefully done to keep everything on the same axis. The process can be very successful and will save some $ as the extra pilots and N&T reamers are less expensive than other chamber reamers.
October 26, 2012, 05:30 PM
I would use steel or brass for the pilot as nylon would flex to much, I think. It is quite common to use different reamers that are in the same family.