Thread: bullet runout

There are many things that may cause run out these can be tested after every step of the reloading process, but one thing alot of people forget to do is check if there fired rounds have good run out numbers before even starting reloading. The expander ball like spanner pointed out is one of the first things to check as they cause alot of the run out trouble in sizing dies. A rubber O ring under the die can help and may be worth a try. Different dies may get you better results, I've had good success with Redding competition sizing and setting dies. An over size chamber can also cause trouble as the dies are sizing the case excessively.