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.
#43 Shellholder fits : 223 Winchester Super Short Magnum
70 Winchester Short Magnum
7mm Winchester Short Magnum
300 Winchester Short Magnum
338 Winchester Short Magnum
#43
Specifications
Manufacturer: RCBS
Manufacturer No : 99243
SKU : 52067
UPC : 076683992437
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.