If your shell holder doesn't securely grip the sell and firmly fit into the press during reloading, you're bound to have headspace and sizing problems. RCBS manufactures their shell holders to the industry's tightest tolerances, using only the finest steel.
#34 Shellholder fits :
6.5mm x 68S
8mm x 68S Magnum
#34
Specifications
Manufacturer: RCBS
Manufacturer No : 09234
SKU : 16320
UPC : 076683092342
Warranty : If any of your RCBS equipment breaks or doesn't work, they will fix it or replace it. No time limit. No questions asked.