Thread: Re-sizing Issues-Tight Chamber?

My current press (lyman crusher 2) with rcbs dies would not bump the shoulder on my 284 even when camming over. This was using hornady shell holders. I knew this by measuring with a headspace gauge and calipers. I simply grinded down my shell holder a touch and adjusted the die down some more until I could achieve the required shoulder bump (2 thou). The lesson being, shell holders are universal but still slightly different. You need to measure using a headspace gauge to ensure you are bumping the shoulder enough or not bumping too much.