Bob, the reamers are sharp and the pressure from pushing them forward along with the lubricant makes for curly cuttings. As compared with an expandable reamer that only cuts a thou or two for each adjustment, and with little pressure to do the cutting. As you know, using an expandable reamer from the muzzle end is fraught with the possibility of tipping it and cutting the choke at a tangent which will make for off shooting on that barrel.
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