Body die will not do what you want to do youll need a FL die to actually resize and push the shoulder back. Get a FL bushing die made for your chamber and itll do everything in one die
Dusty,
With much respect, if you pull the bushing out a FL die what you have left will give the exact same result as using a body die.
Friends and I have done the two step sizing process and for some applications it seems to give slightly better results. One example is when you are working with cases that are not going to get their necks turned.
Some time back a fellow that has a well built .308 was doing some load testing sizing with a good fitting Redding bushing FL die. His necks, had been slightly turned just to clean them up. He was in a mood to experiment, so I suggested that he try using a collet die first and then his FL die with the bushing removed. For whatever reason, his results were slightly improved.
Later, after a layoff, when he started loading and shooting that rifle again, for some reason he went back to the FL busing die, until I reminded him of his previous test, at which point he repeated it, with the same result.
There are a lot of variables that could influence the outcome in a situation such as his, one being whether a powder "likes" a lot of neck tension. In his case he was working with Varget, and that was not a requirement, although he did order and try a couple of smaller mandrels for the collet die. Perhaps if he had been working with a different powder the results would have been different. In any case, I have done the two step process starting back a couple of decades ago for some situations, but certainly not all. The good thing is that if you already have a bushing FL die, it only costs you the price of a collet die to do the experiment, and they are inexpensive.