AXL beat me to it with AW method. I wish I had know this earlier and stress it to others.
I had 500 virgin Peterson brass for my BR that was running into wired pressure issues at low velocity and I ended up giving up on the brass. I watched Wheelers video and then later thought to retry the Peterson brass. Even though it was new I found my bolt met resistance trying to chamber using this method and so it was a headspace issue with fired brass. Now after bumping the shoulder I can use that brass with confidence.
I had 500 virgin Peterson brass for my BR that was running into wired pressure issues at low velocity and I ended up giving up on the brass. I watched Wheelers video and then later thought to retry the Peterson brass. Even though it was new I found my bolt met resistance trying to chamber using this method and so it was a headspace issue with fired brass. Now after bumping the shoulder I can use that brass with confidence.