CW is spot on;
If you gonna chamfer, IE remove material you need to get a feel for what your doing. Remove too much and you have wasted a case.
The Lyman tool sucks, it's too easy to get it at a little angle and mess up the pocket, primers will fit loose and you'll be sad.
I use the RCBS chamfer tool, chucked in a drill press and hold cases in a wood "pliers" I made. It works OK, short learning curve, I've done about 1000-223.
IMHO swaging is your best bet and of all that I have used the Dillon is the best. It is a tad expensive so many go with the RCBS or Hornady or even the Lyman tools. Of the three I like RCBS and Hornady best.
Yup, NOT removing brass has to be a good thing,
The Dillon is spendy. I shoot bolts and singles so I can recover brass for the most part and can't justify the expense, those 1000 LC I have will last me many years.
I do have an eye out for the RCBS swaging dies at auctions and shows but you sure don't see'm unless they're missing parts or rusted bad. That tells me people are hanging on too'm for some reason or another.