So, tell me, does the reamer for this have an extended pilot for this purpose or do they just dangle the ordinary reamer into the chamber and hope it finds it's center?
It is not a matter of a the reamer finding the center, it will do that if the existing chamber is already centered on the bore. If one single point turns a hole centered on the bore - a reamer will follow that hole as well. It would require no pilot at all to do that. For a reamer not to follow an existing hole would require quite a bit of side pressure holding it off center.
A loose fitting pilot is actually better than tight fitting pilot if your set up up is accurate.
It does not matter if you prefer to use extended pilot reamer or not. It is the end product that matters and you can achieve an excellent chamber with what ever method you use if your set up and method are sound. An extended pilot reamer is not a necessity.
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