so I spent some time on the net sussing out the dies and adapters, rung Western Firearms who were out of stock of the 303.25 dies, turns out they were coming back in stock yesterday afternoon so I ordered a set from them, looking at the pictures of the simplex ones and talking to a couple of gun shops they are old new stock, hence all the surface rust on them and the 5/8 threads.
Took a photo of my empty cases that have split, these were loaded about 20 years ago, had no problems whatsoever when they were loaded yet now they are splitting, they are a mix of resized 303 cases DC 41 VllZ and riverbrand 303.25 cases. Will put another photo up of some reloaded ones, they havent been formed properly with the projectile not sitting true.
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