Thread: 303 Query

Originally Posted by Juicy

Ive found they shoot quite differently between neck sized and FL sized. I FL sized a bunch of 303 cases, tried some different charges. I found one that grouped really well (45gr of 2209 behind a pulled greek 174 projectile). I then tired neck sizing the fired cases, used exactly the same charge, bullet and stick out and the group was terrible. So yeah I have found FL sized vs neck sized does not shoot the same. Hence why ill now only FL size for that 303, I anneal the necks which will hopefully extend the brass life.

FL sizing really moves the shoulder by a huge amount compared to other calibres so its no wonder the brass might fail quicker

Anneal the neck or anneal the case? My inital sizing resulted in an inability to chamber. Had to remove the "ridge" on the shoulder. Problem solved. Probably helped took to the bolt with WnD 2000. There is a tool to dismantle the 303 bolt which I saw on YT. However it is not my rifle. It has been fascinating to finally load this round. First rifle I used in the Ruahines in 1974.Some say the action on the venerable 303 is the best ever made.