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.
#39 Shellholder fits : 38 Colt Super Automatic
#39
Specifications
Manufacturer: RCBS
Manufacturer No : 99239
SKU : 16324
UPC : 076683992390
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.