50bmg redding ultramag possible?

[waverace]

I bought a Redding Ultramag press some time ago to load magnum rifle cartridges and from what I read at the time to load 50 bmg if and when I got one , its a great press and I have had no problems with any cartridges up to 338 Lapua however here's the kicker , I am now looking to get a 50 bmg so I have started to look for the equipment to reload , dies no problem , but shellholders are all the screw in type which the ultramag has no provision for , does anyone make a normal snap in type of 50 bmg shellholder? , I cant find any through google searches so was wondering if anyone here had seen or heard of one if not it looks like I will have to either make one or shell out for another press.