Since you are asking this question, I will guess you are not using a 550B Dillon Reloader.
I have had RCBC for years. They work great. I bought Dillon Dies for the 550B, as they work better for volume production using the Dillon Machine.
You might also add a Lee Push Through Full Length Sizing Die. I think they call them a Bulge Buster. They take any bulge out of the case from being fired in an unsupported chamber.
I reload my 40 S&W Range Brass for reuse in either my 610 or 310 Night Guard Revolvers. Revolvers do not like bulged shell cases. A regular Full Length Sizing Die will not size down far enough to iron the bulge completely out if it is a serious bulge. The Push Through sizing die does. Works just like the Lee Bullet Sizer.
Bob
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