I've had all my parts shipped to my grandfathers house (retired gunsmith) as we are going to build my savage together. I'm building a long action with a hinged floorplate. I ordered the action brand new. I talked to him yesterday and the barrel had come in. It's a standard shank 260 from McGowan. He said he was able to screw the barrel all the way to the bolt face, but when he tried to tighten the nut, it wouldn't grab threads and he could slide it up and down the threads. I had talked to Savage and they had told me that I had a standard shank. So I'm wondering if I just received a nut for a large shank? I haven't actually seen it, but I'm guessing that is the case. Any thoughts would be appreciated.