Making your own reamer doesn't have to be that difficult.... Here is one of the first ones I made....It has only a single cutting edge.... The pilot diameter slides easily into the lands, and the taper for the leade is 2* per side (4* included).... with the parallel chamber section about 0.002" over the groove diameter.... After turning to diameter, I milled a groove from the back of the pilot to long enough o protrude from the breech end of the barrel at full depth.... The groove is milled to the centerline on the side of the mill, and about 0.010" past the centerline on the end of the mill, which puts a slight rake on the cutting surface.... The deeper you go, the more aggressive the cut but the poorer the finish.... The material was O1 drill rod, hardened by oil quenching, and then tempered in the oven to a dark straw.... It works just fine at up to about 40 rpm.... but you do have to feed slowly, and withdraw and clean of chips frequently....Bob
I do when I have to, but I don't sell them.... No idea if anyone else is making them....Bob
I'd be interested in doing it for hire after I prove to myself that they are functional.