Wes,

I looked at that mould and saw the large baseband. Should I reduce it?

I have changed diameters a few times. I figured out that that 185P bullets we’re actually 30-1 so I am going to cast some with a couple of moulds in that weight range.

No but I found a recently purchased Ideal mould with similar dimensions that had not tried in 30-1. I figured I would also cast a Saeco 632 and a Hoch in the same 180 gr weight range before making a decision. I might just go ahead and order the one you like anyway. 
I originally bought the 32-185P to see if it would be as good as the Hoch I have in a relined 32-40 barrel that I was going to mount on my crusty receiver and sell with one of my breech seaters as an entry level package. That mould did not shoot well however and I abandoned the project. I think I vaguely remember selling the mould on this forum a while back.  Silly me!

Groove looks to be .320 and bore of .315.

Here are the 30-1 bullets I cast today for my next outing.

The mystery mould is an excellent quality mould with absolutely no markings on it. 

Jack

One thing that I found when working with 30/1, was that when I first ried it, I got a exceptional group so, I switched to it. After a few months, I found that overall the 20/1 produced more reliable groups, with less fliers. So, I switched back.

30/1 is more susceptible to deformation, when shooting the higher tapered bullets, too. I think I'd try to keep the taper at no more than .003 or use cylindrical bullets with 30/1.

Jack, Raton, they have IS matches at Raton. Or you can leave your scopes at home and use ISs exclusively. If you show up at Raton with your nice Winchester you will be a hit!