I thought that I had a handle on this then when making two attempts at a reamer that were soft I near gave up
Third one worked but I would love to have someone experienced walk 'us' through the process.
oh yes what the project required was a long reamer made to open the barrel to just past the transfer port and then give a nice 5 degree leade to the rifling.
What made all this tricky was the barrel is in the receiver of a B51 BAM PCP and I did not want to remove that barrel.
pellets loaded very rough and showed major smears on the skirts. Kodiaks loaded real rough.
So reamed the free bore to 0.228" then made up a tapered reamer with a 5 degree nose and a 0.2275" straight guiding section.
If I make another go at this it will be an all in one piloted reamer.