ok, got a question, to date I have only full length resized my 7mm because I have 2 different guns. But today I picked up my new 300 rem ultra mag, and need to press some shells for it. I need to know how to set my die so I am not f/l resizing my brass, ( I assume I dont need to f/l resize since I will be using this brass in the same gun). I guess what I'm asking for is a detailed instruction on how to properly put my die into my press and determine if Im only neck sizing or f/l resizing. Any help would be greatly appreciated. I shot it for the first time today, and got about 1.25" groups, with factory rem premier ultra/ 180 gr nosler partitions, maybe I should just shoot them, but at $31 a box I'd rather reload.