How is the chamber lead angle determined?

[craneman]

Don,
Great minds think alike, after discussing this with Kurt I believe that is exactly what I am going to do. By my calculations if I order a throating reamer that will extend the chamber to remove the freebore I should end up with a chamber that will take brass 2.583 in length which gets me where I had envisioned, with a 7 degree leade...
at least that is the plan.

Todd