The problem I am having is way above my head, i have a 300WM that shoots great as long as I use new brass or factory ammo. I am having pressure issues with my resized & reload brass. Does not matter what brand, have tried Nosler, Peterson & Hornady all 3 work great on 1st time. I have 3 different FL resizing dies I have tried. I am not loading any extreme, 180gr at 2885, using H-4831 and R-23 with CCI-250's. I have tried 3 different factory loads with some 100fps faster than mine and they work perfect.
I have another CA 300WM I load for with no issues.
It is a CA so I know they can have issues, the gun shoots really good so I will use unfired brass to hunt, I would like to understand why this is happening if someone can help.
I have pushed the shoulder back to what the new brass measures with no success.
I am no pro but I load a bunch so I don't need to be told the basis loading procedures, this is a problem that a professional I think will only be able to solve.