Not Ground Correctly, Dull
Brownells 11 chamfer cutter works great, but the 5 chamfer cutter is a round chunk of steel. The one I was using on a 45-Cal revolver did't cut worth anything. The 5 cutter was dull from the beginning, and apparently the tool grinder doesn't know how to back-relieve cutting flutes. Unless great improvements are made, I would never recommend this cutter.
Failed to cut - damaged the barrel
Just as Keith Sharp said in his review, this cutter would not cut at all. It did, however, damage the barrel. I read some literature from a rental outfit that says that these are high speed steel and that this "may not" cut newer stainless steel barrels that can be ultra hard. Brownell's needs to look into this. If the cutters are defective, find another source. If the cutters will not cut modern stainless, the ad should say that. This issue cannot be left alone.
My 45 cal, 5 Degree Did Not Cut.
I tried this 5 degree cutter to cut forcing cone of my 45 LC Blackhawk. Cutter chipped and dulled quickly. I returned cutter for refund. I had to clean up damage caused by 5 degree cutter using their 10 degree cutter. Forcing cone is now oversize and 10 degrees. Thank You Brownells