The Dasher is one of the hardest rounds to form. I don’t know that I would use the COW method, due to the amount of area the case has to grow. The problem with the dasher is, if you don’t get the case against the bolt head, it will only partially size. I would recommend sizing the case up, then partially sizing the case back down creating a false shoulder, that would hold the case aginst the bolt head. (Even if you use the COW method.) The COW method can be extremely dangerous, and if you don’t know exactly what you’re doing (Powder type/and weight) things can get scary real quick. It is also something you have to have a high leval on consentation when loading, you double charge a case you will be in big trouble. I have also seen where 1 gr difference will make a sticky bolt, and leave ejector marks on the case.
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