need 338 lapua improved or ? reamer

[Plott hound]

Hi allI am in need of some good advise. I am in middle of building a 338 lapua and want it to be of the improved type. I like what I read about the Allen Xpress and the yogi. Question is is there a reamer that I can buy AND that there is already reloading dies for it? Or do I need to go through the full process of wildcating some. Would like a 37.5 degree with little body taper. 35 would be ok also. 30 inch barrel . Any help would be great. Thanks all
Plott Hound

[Akiona]

I have two brand new improved reamers with go gauge. No dies. Dies were going to be made with reamer.