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Will be loading once fired .223 brass on a Dillon XL650. I am going to buy their electric case trimmer die set up.
Do you have to re-size before trimming, or can you trim, then re-size.
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The general answer is to size before trimming, since sizing (full length sizing in particular) causes the case to lengthen. However, in the specific case of the Dillon RT1200B trimmer you have a Full Length die and a trimmer combined, so it will inherently size before trimming and there's not much you can do to change that (apart from enlarging the dimensions of the die). Some choose to run a body die before the Dillon trimmer, some run a Small Base die after it, and there are probably other combinations in use too, but you'd probably want to try the RT1200B on its own first and only look at additional complications (and increased working of the brass) if you have problems. Bear in mind that the die in the RT1200B does need to grip the case, so excessively sizing the whole case before the RT1200B is probably not a good idea. Note also that the neck dimension of the RT1200B die is quite tight compared to what you might choose for match ammo in some calibers.
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