CH4D makes the die and it isnt expensive, under $50 if I remember, but you might need to machine off some of the toolhead to allow the chips to be sucked away.
I milled about .350 off my 1050 toolhead to make it work.
You will have to machine a tool head for the hose attatchment to work. If you don't already have a RT1200, the Rapid Trim for 7.62x39 has a longer trimmer shaft and die and will work on unmodified toolhead. I beleive the 7.62x39 trim die needs to be shortened al little to trim brass to right length.
Damn. How far does your 300 Whisper brass protrude into the window on your CH4D die? Mine doesn't even make it into the window. I think they forgot to run the counterbore for the trimmer shaft deep enough so that the brass could be trimmed. My brass is 1.355 for reference...
Kevin
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In reading all the 1200 trimmer threads, am I correc tin thinking that you need to mod a toolhead to use the std 1200 trimmer with a CH4D die, or you can buy the 7.62x39 1200 trimmer?
Is the x39 trimmer compatible with other Dillon dies or is it solely for x39 because of extended shaft?
I dont want to end up with a trimmer thats for 1 caliber only