I am completely stumped. I can run Hornady, Norma, ect .338LM Brass easily into the recommended shell holders, However, when I try to insert a piece of Lapua Brass (my choice Brand) will not fit in the RCBS #14 or Redding #35 Shell holders. I am at at loss. I have done a multi day extensive search on the Hide and through out the internet. If anyone has any advice on what to do, I am all ears. Thanks for your help.