Well, sorry, he may be "a very reputable smith" but he is wrong on this one!
The Remington thread is smaller, not larger, than the standard large ring Mauser thread, as any reputable smith can tell you.
Having said that, as
greydog has pointed out to you, he may be talking about a large ring Mauser with a small diameter thread like some of the Turkish Mausers have. <img src="/ubbthreads/images/graemlins/crazy.gif" alt="" />
