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Rifles, Reloading, Optics, Equipment
Reloading
What if my necks are tight enough to hold a bullet firmly AFTER firing..
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<blockquote data-quote="edge" data-source="post: 244982" data-attributes="member: 5030"><p>Sounds like you have the perfect fit.</p><p></p><p>Form "Secrets of the Houston Warehouse" :</p><p></p><p><strong>Virgil would then outside turn the necks for a total clearance of about .0007" between loaded round and chamber. Since the neck turner left cutting rings, Virgil sanded the necks shiny smooth, which typically resulted in a somewhat widened neck-to-chamber clearance of .00075". He emphasized that until the hills and valleys were smoothed, the case neck was prevented from laying flat against the chamber. Flash holes were cut identically and chamfered inside, but he didn't uniform primer pockets or turn the case bases. He also had not the foggiest idea what amount of case-wall variances existed in any of his brass, but in those excellent Sako cases, probably not much. </strong></p><p><strong></strong></p><p><strong>Then came the final, critical step — the step requiring a sensitive touch and #400 sandpaper — the "tuning" step. "The secret," Virgil said, "is to get the neck tension — the grip of the brass on the bullet — exactly the same on every case. You do this by firing the case and then feeling the bullet slide in the case neck as you seat it. Here, a micrometer won't do you any good. Feel is the whole thing. If any case grips the bullet harder than the others, you take three turns over the sandpaper and fire it again, until you get exactly the same amount of seating pressure. Until the necks were tuned, I didn't feel I was ready to start tuning the gun." </strong></p><p><strong></strong></p><p><strong>Virgil continued: "You can change the powder charge slightly, and it won't really make any difference, but if you change the bullet seating depth or the grip on the bullet, you're going to see bad things happen fast." </strong></p><p><strong></strong></p><p><strong>After a case has been fired a couple of times, another condition is created in the neck that requires sensitive feel. A tiny groove pressed into the neck by the pressure ring on a flat-base bullet causes the bullet to "snap" into place when it's seated. Virgil emphasized that feeling the bullet slide down the neck and then snap into place told him everything he needed to know about whether that round was going to go into the group or not. </strong></p><p><strong></strong></p><p><strong>To sense these critical events, Virgil seated bullets in a Wilson straight-line tool BY HAND — not arbor press. He estimated that the seating pressure on his hand was moderate — perhaps 15 pounds. If seating requires significantly more pressure, the operation damages the bullet's fragile pressure ring, bulging your groups. If the seating pressure is too light, he said you're assured a mediocre .250" rifle. </strong></p><p><strong></strong></p><p><strong>Virgil did not size his case necks. With about .00035" clearance on all sides between the loaded round and chamber neck, the natural spring-back of the brass, in combination with his neck preparation, correctly gripped the bullets. Some other warehouse shooters, including T.J. Jackson, followed the same practice.</strong></p><p></p><p>edge.</p><p></p><p><a href="http://www.angelfire.com/ma3/max357/houston.html" target="_blank">http://www.angelfire.com/ma3/max357/houston.html</a></p></blockquote><p></p>
[QUOTE="edge, post: 244982, member: 5030"] Sounds like you have the perfect fit. Form "Secrets of the Houston Warehouse" : [b]Virgil would then outside turn the necks for a total clearance of about .0007" between loaded round and chamber. Since the neck turner left cutting rings, Virgil sanded the necks shiny smooth, which typically resulted in a somewhat widened neck-to-chamber clearance of .00075". He emphasized that until the hills and valleys were smoothed, the case neck was prevented from laying flat against the chamber. Flash holes were cut identically and chamfered inside, but he didn’t uniform primer pockets or turn the case bases. He also had not the foggiest idea what amount of case-wall variances existed in any of his brass, but in those excellent Sako cases, probably not much. Then came the final, critical step — the step requiring a sensitive touch and #400 sandpaper — the “tuning” step. “The secret,” Virgil said, “is to get the neck tension — the grip of the brass on the bullet — exactly the same on every case. You do this by firing the case and then feeling the bullet slide in the case neck as you seat it. Here, a micrometer won’t do you any good. Feel is the whole thing. If any case grips the bullet harder than the others, you take three turns over the sandpaper and fire it again, until you get exactly the same amount of seating pressure. Until the necks were tuned, I didn’t feel I was ready to start tuning the gun.” Virgil continued: “You can change the powder charge slightly, and it won’t really make any difference, but if you change the bullet seating depth or the grip on the bullet, you’re going to see bad things happen fast.” After a case has been fired a couple of times, another condition is created in the neck that requires sensitive feel. A tiny groove pressed into the neck by the pressure ring on a flat-base bullet causes the bullet to “snap” into place when it’s seated. Virgil emphasized that feeling the bullet slide down the neck and then snap into place told him everything he needed to know about whether that round was going to go into the group or not. To sense these critical events, Virgil seated bullets in a Wilson straight-line tool BY HAND — not arbor press. He estimated that the seating pressure on his hand was moderate — perhaps 15 pounds. If seating requires significantly more pressure, the operation damages the bullet’s fragile pressure ring, bulging your groups. If the seating pressure is too light, he said you’re assured a mediocre .250" rifle. Virgil did not size his case necks. With about .00035" clearance on all sides between the loaded round and chamber neck, the natural spring-back of the brass, in combination with his neck preparation, correctly gripped the bullets. Some other warehouse shooters, including T.J. Jackson, followed the same practice.[/b] edge. [url]http://www.angelfire.com/ma3/max357/houston.html[/url] [/QUOTE]
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What if my necks are tight enough to hold a bullet firmly AFTER firing..
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