Jim Borden was a "Professional Mechanical Engineer", and happens to be a reputable machinist.
This is what I was trying to say on my reply way back before the mud slinging started. Thanks Dave for putting it into the correct terms : )I've broken one reamer. I knew it wouldn't make it as soon as it touched steel. A 17 Mach IV. Very thin flutes and a small diameter core. It would grab and twist. Nothing I could do but wait for the crash. I worked with Dave Manson when he was still running Clymer to work out some problems I was having. I was having a bitch of time making sizing dies. The issue was every angle on the reamer changed as soon as it touch steel. You could watch the reamer twist from the load. He increased the diameter of the core and made the flutes thicker. Pretty much eliminated my problems. Everything is a compromise so the fix reduced the chip capacity of the reamer.
Dammit!! Just broke a flute off a .260 reamer that I've had for 15 years! So it isn't the steel that they're using to make the reamers. Wonder if the barrel makers have changed something in the steels they are using?