My guess is that Ruger tailored it to the 122-grain bullet. The 7.62X39 has all the freebore and leade features in the chamber to provide plenty of space to always insure reliability. It will chamber no matter what. That leaves a lot of space around the small, more common bullet. I think Ruger might be trying to make the accuracy more acceptable by reducing the unsupported travel.klr wrote:I wonder why these manufacturers cut the chambers like this?
It is threaded into the receiver.klr wrote:It's been years since I had a Mini 14. How is the barrel held in place?
I would rather go ahead and take it apart and work with the floating pilot chamber reamer. It needs a chamber reamer over a throating reamer so the features of the step are completed.klr wrote:I wonder if you could get/make a pull through style reamer to work?
I drew up what it should look like when finished.