Jump to content
Brian Enos's Forums... Maku mozo!

Fclass

Members
  • Posts

    1
  • Joined

  • Last visited

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

Fclass's Achievements

Looks for Range

Looks for Range (1/11)

  1. YES. The simple answer is you understand the basic concept of neck tension. Like anything else regarding precision reloading there is never a simple answer. I think I agree with most everything posted in this string, not sure I agree with fouling inside the case neck though but I am very particular regarding case cleaning. I am an F-Open shooter currently campaigning a 284 Win running Lapua Brass. I run a .315 chamber which means I have to turn necks to get the desired neck to chamber clearance, I try to have my completed cartridge measure .3115" +/- .0004" at the neck. As hard as I try to make them all exactly the same when measuring out to the ten thousandths ( .0001") , they will not be exactly the same. How much neck tension is the right amount? Many people will say “just enough” meaning run as little as you can without having the bullet move after you seat it. I am not sure I agree with that. I have found my rifle likes a little neck tension. Every barrel is different. Different cartridges are different, the 284 likes more tension than the 6 Dasher. I am surprised no one mentioned measuring neck tension when you seat the bullet. By using an arbor press with a dial indicator you will both see and feel the amount of pressure it takes to seat the bullet. That pressure equates to the amount of neck tension. The more effort / pressure it takes to seat the bullet the more neck tension you have. The dial gauge will quantify the reading for you. If you are not an F-Open competitor that obsesses over every detail involved with reloading I would recommend the following. Fire form your brass. Decap only and then clean it thoroughly. I anneal after every firing but you can cut that back to every 3rd firing. I use a whidden bushing die because it is one of the few that will both bump the shoulder and size the neck at the same time. Take the decapping rod and expander ball out of the die. I do not recommend using an expander ball on anything other than spray and pray ammo. If you use a bushing that is .002” smaller than your completed cartridge you should be in the ball park. If you want to obsess over neck tension you can get multiple size bushings and invest in a set of expander mandrels from 21st Century that come in .0005 increments and expand back up after you down size with the neck bushing and play with different combinations of the two. All brass will have some “spring back”. If I down size with a .309” neck bushing and then run a .2840” expander mandrel through it the inner dimension will not remain at .2840” it will spring back to something smaller than .2840”. The proof will be in the dial indicator when you seat the bullet. Help this helps.
×
×
  • Create New...