Protocall_Design
Vendor
1- The reamer has a pilot on the front that fits in the throat. It will follow the hole that's already there. You would have to intentionally try hard to make it do anything else.
2- There is a shoulder on the reamer that is the diameter of the counterbore. When the shoulder on the reamer just kisses the counterbore, you're there. You may want to go just enough to make the c'bore on the extractor and the cylinder the same level if they aren't already.
With a reamer, you have exact size and shape guaranteed. With honing or lapping, you are guessing and have no way to control size or shape accurately. The reamer will only cut to the size it's made to, and no more. If a chamber is already the right size, it won't cut anything.
2- There is a shoulder on the reamer that is the diameter of the counterbore. When the shoulder on the reamer just kisses the counterbore, you're there. You may want to go just enough to make the c'bore on the extractor and the cylinder the same level if they aren't already.
With a reamer, you have exact size and shape guaranteed. With honing or lapping, you are guessing and have no way to control size or shape accurately. The reamer will only cut to the size it's made to, and no more. If a chamber is already the right size, it won't cut anything.
