HSS is normally sharper than carbide, cobalt sharper than HSS. Some of the new micro grain carbide are really sharp but 2-3 time the price of HSS or cobalt.
The burr at the cut is due to a dull cutter or being carbide, rolling the edge and not cutting. Like I said earlier carbide likes heavy cuts and fast feed rates. This is why I recommend cobalt, a better cutter for our application.
As far as finding cheap reamers, good luck with that. If your around a shop that does a bunch of chamber work you may be able to get one that at it's end of life. For what we are using it for you don't care about the leads/pilot.
I have 223R min spec reamer that I used on one of my guides for the trimmer I made. This is my adjustable one that I use for my 223R. I reused the 3-way trimmer that came with the Trim-It II. It now cuts even all the way around the mouth with no twisting of the brass to even it out.
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These are my nonadjustable ones. The one with the short shank is used in my lathe.
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My guide bushing just push into the bearing. They were cut to fit the profile of the cartridge taper, and bottom out on the shoulder. The length is long enough so they feed in straight with no tilting. The one on the right has a carbide cutter in it, the other HSS. I have some cobalt cutters coming the next time I place an order.