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Rifles, Reloading, Optics, Equipment
Reloading
First loads after annealing, no neck tension
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<blockquote data-quote="Bart B" data-source="post: 365462" data-attributes="member: 5302"><p>In a demonstration for a friend, I took one new Federal .308 Win. case, loaded it with a max charge of powder under a 165-gr. bullet, fired it, then full length resized it in a standard RCBS die whose neck had been lapped out to 2 thousandths smaller than the loaded round's neck diameter. The chamber was a standard SAAMI dimensioned one. Fired case shoulder was set back 2 thousandths each time. Body diameter was reduced about 2 thousandths when sized.</p><p></p><p>After reloading that case 46 more times before running out of powder, bullet tension during seating remained the same for all 47 seating operations. The only thing that changed was having to trim the case back to 2.000 inch after eight firing and reloading operation. The case shortened a bit less than 1 thousandth when fired then lengthened a bit more than 1 thousandths after full length sizing. </p><p></p><p>Never annealed the neck. Muzzle velocity spread was about 30 fps about 2650 for all 47 shots. Evidence neck tension was reasonably consistant for all shots. Primers seated with the same force so there was no noticable expansion at the case head.</p></blockquote><p></p>
[QUOTE="Bart B, post: 365462, member: 5302"] In a demonstration for a friend, I took one new Federal .308 Win. case, loaded it with a max charge of powder under a 165-gr. bullet, fired it, then full length resized it in a standard RCBS die whose neck had been lapped out to 2 thousandths smaller than the loaded round's neck diameter. The chamber was a standard SAAMI dimensioned one. Fired case shoulder was set back 2 thousandths each time. Body diameter was reduced about 2 thousandths when sized. After reloading that case 46 more times before running out of powder, bullet tension during seating remained the same for all 47 seating operations. The only thing that changed was having to trim the case back to 2.000 inch after eight firing and reloading operation. The case shortened a bit less than 1 thousandth when fired then lengthened a bit more than 1 thousandths after full length sizing. Never annealed the neck. Muzzle velocity spread was about 30 fps about 2650 for all 47 shots. Evidence neck tension was reasonably consistant for all shots. Primers seated with the same force so there was no noticable expansion at the case head. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
First loads after annealing, no neck tension
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