I posted a question over on the GUNSMITHING section; "Wierd Chamber???" Please take a look and respond. Maybe you have had a similar situation. Or could shed some light on this situation.

FN in MT

I saw It Frank & threw in my 2 cents worth.

I think somebody over there got it right, the smith likely used a subcaliber reamer to chamber with, followed by a neck&throat reamer. These used to be a standard Clymer part and cheap, but they are an expensive custom now. Whoever made the other post trashed it, but it is acutally a good process and the reason roller piloted reamers were developed. If you chamber a lot of 30/06 or 284 based wildcats, you only need one reamer, a set of roller pilots and a set of throat/neck reamers. As long as a piloted reamer is used, this is a good way to chamber.

You need to take the gun back to the smith. If he reamed the neck too large somehow, he has some serious barrel work to do. More than likely, he needs to take 5 minuts to run the N&T reamer in a little deeper.

The accuracy problem, if the chamber is short, is being caused by the neck being pinched and the throat being too short to clear the bullet.

Frank,
Like many have said it sounds like the smith used an 06 reamer and then used a simple neck/throat reamer to open it up to 338. I have a 280 improved reamer that I have used just like that. I've made a 30, 338, 350, 375, and 416 without any problems. A camber cast would show it or simple have the smith recheck his work.

Neck is too short, just has to be reamed out a bit.