I've owned a .17-222 on a 98 Mauser Action & Douglas 1:10 heavy varmint barrel since the early '70s. I shot a lot of groundhogs & fox with it in those days out to 400 yrds. I lost all my reloading data over the years with divorces, tornados and moving a lot of times. I've been working up loads...
Bullet run-out is measured off the bullet not the case neck as someone mentioned they were doing. I reduced my bullet run-out by buying a Redding Competition Seating Die. It has the floating tube guide that aligns bullet straight in the die with the mouth of the case. Checked on a Hornady...
Someone on another shooting site forum posted a link to Long Range Hunting and an article about cross hair alignment. I'm always looking for more information to help me learn more about reloading and shooting so I joined your site.