sodwyer wrote:Are they worth the purchace ?
I'd give that a big "YES" if you want another small but important accuracy advantage with your handloads.....every little bit helps in the big picture.
Look at the units that register off the bottom of the inside of the case, and NOT off the case mouth, as then the consistency/uniformity of the bevel of the flash hole will vary in depth, thereby changing the weight of each case randomly if the cases are not all trimmed to the exact same length.
Both Sinclair and K&M offer flash hole deburring tools that register this way, and not on the case mouth. Both tools can be used manually or with a power screwdriver.