Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Video On Bump sizing cases.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="J E Custom" data-source="post: 1842437" data-attributes="member: 2736"><p>Just something to think about. Why go to all the trouble to blueprint an action. load concentric ammo and feed it sloppy fitting cartridges. Also when fire forming an AI cartridge it is common place to have a .004 to .006 negative head space that Places the bolt in compression? it is to hold the cartridge so there is no forward or backward movement during fire forming and producing accuracy that many times exceeds the accuracy of a cartridge that Is full sized for a standard chamber and has "Slop In the chamber fit".</p><p></p><p>Many Improved cartridges will shoot 1/2 MOA groups while fire forming even though the case is re forming to the chamber shape It cannot move forward stays on the centerline of the barrel bore and has no head space what so ever.</p><p></p><p>That is why I feel that doing minimum sizing for accuracy in bolt actions to assist the bullet in perfect alignment of/with the bore can only help. Full length sizing and bumping the shoulder</p><p>may make it easier to chamber and definitely easier to load but it is counter productive to all the care and precision work that goes into blueprinting/truing and action and turning necks and loading quality concentric ammo.</p><p></p><p>I full length sized for many years while competing and was happy with 1/2 MOA, but when my priority became extreme accuracy for extreme distances, I had to improve everything associated with the firearm, quality, loading and shooting proficiency. Now My starting accuracy standard is</p><p>less that 1/2 MOA with the goal of sub 1/4 MOA or better and if I manage to get everything right sub 1/10th MOA. I feel this level of accuracy is necessary if you intend to shoot extreme distance. If you hunt 3 or 400 yards this level of accuracy is definitely not required so do what is best for your needs. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1842437, member: 2736"] Just something to think about. Why go to all the trouble to blueprint an action. load concentric ammo and feed it sloppy fitting cartridges. Also when fire forming an AI cartridge it is common place to have a .004 to .006 negative head space that Places the bolt in compression? it is to hold the cartridge so there is no forward or backward movement during fire forming and producing accuracy that many times exceeds the accuracy of a cartridge that Is full sized for a standard chamber and has "Slop In the chamber fit". Many Improved cartridges will shoot 1/2 MOA groups while fire forming even though the case is re forming to the chamber shape It cannot move forward stays on the centerline of the barrel bore and has no head space what so ever. That is why I feel that doing minimum sizing for accuracy in bolt actions to assist the bullet in perfect alignment of/with the bore can only help. Full length sizing and bumping the shoulder may make it easier to chamber and definitely easier to load but it is counter productive to all the care and precision work that goes into blueprinting/truing and action and turning necks and loading quality concentric ammo. I full length sized for many years while competing and was happy with 1/2 MOA, but when my priority became extreme accuracy for extreme distances, I had to improve everything associated with the firearm, quality, loading and shooting proficiency. Now My starting accuracy standard is less that 1/2 MOA with the goal of sub 1/4 MOA or better and if I manage to get everything right sub 1/10th MOA. I feel this level of accuracy is necessary if you intend to shoot extreme distance. If you hunt 3 or 400 yards this level of accuracy is definitely not required so do what is best for your needs. J E CUSTOM [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Video On Bump sizing cases.
Top