Signguy Gary wrote:Ok so now im going to show my reloading inexperience how do i trim neck dia. I've trimmed neck length but not dia.
Outside Case Neck Trimming or Case Neck Thickness Trimming is what you want to research. No big deal at all, just another process that anyone can master. I would start reading on two websites: K&M Manufacturing and Sinclair International. We can help with the finer points once you are ready to roll (or trim, or turn). You will need an EXPANDING mandrel and a TURNING mandrel. These really do need to be manufactured by the same company for best results.
On Edit: Curious why you want to use 204R brass for the 17 Remington. Not too many guys with a 'surplus' of 204R cases.