Welcome. You have what is known as a Wildcat you will have to create your own ammo probably from 338 Winchester brass, you may have a .375 Durham Magnum or a .375/338 Chatfield Taylor both are very similar, a competent gunsmith can figure it out, then tell you which dies you need. Good Luck, have fun and be Safe.

 

Do you know, or can you ask who you got it from who did the work? You might be able to reach out to to the gunsmith who did the work. But yes, it’s a wildcat. The easy answer is that it’s a .338 win mag necked up to .375, but that is an assumption that should not be taken to the bank. It’s probably pretty straightforward once you get it figured out. A chamber cast or fired case sent to Redding or RCBS will get you a set of dies, no problem.

 

Do
.. A chamber cast or fired case sent to Redding or RCBS will get you a set of dies, no problem.

Aprox, what would it cost to have a custom-made die produced?



Compulsive primers reloader

 

You have to contact Redding, I don't think RCBS is making custom dies now.

 

Xbowhunter please let us know the outcome it does sound interesting. A couple of years ago I bought a rifle with similar issues, a 6.5-270 Stegall improved, it was fun working it out.

 

The way the barrel is marked would get me onto the phone to McGowen. It looked to me from the marks that McGowen installed the barrel. That would establish the original caliber. Now the next step is to figure out what the caliber is now. Has the gun been altered since it was put together is the question.

CH4D may be able to help you on the dies. In my experience that company makes good dies and has good customer support. The owner was very helpful getting me going making 256 Newton cases using their dies.

There's an old expression down here about learning how to swim in the deep end of the pond. If you do not reload starting with the wildcat you are in the deep end of the pond. Been there done that.

Right, RCBS no longer offers the custom wildcat die service.