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Rifles, Reloading, Optics, Equipment
Reloading
ladder test help.....
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<blockquote data-quote="Bart B" data-source="post: 518629" data-attributes="member: 5302"><p>I don't think actions and cases have to be perfect. </p><p></p><p>Primers and powder charges aren't perfect; fixed amounts of their main ingredient causes muzzle velocity spreads. And cases don't have to be perfect; a couple thousandths spread in body and shoulder wall thickness doesn't matter. Case necks are fine if their thickness doesn't have more than half a thousndths spread; they can be fired in chambers with several thousandths clearance to the chamber neck and all shoot just fine.</p><p></p><p>The smallest series of 10-shot test groups at 600 yards I know of were shot back in 1970. An old classic Win. 70 pre-64 action with a sloppy bolt fit that wasn't in perfect alignment with the barrel tenon thread axis was used, but the Hart barrel's bore, chamber and tenon axes were all in perfect alignment. And the receiver face as well as the bolt face were squared up with the chamber and tenon axes. Western WCC58 cases were used holding IMR4064 powder; I forget what primer was used. The FMJBT bullets used were spun at 30,000 rpm checking for ones that were perfectly balanced as indicated when current to the motor was steady at its lowest reading. Maybe 10 out of a box of 100 were so balanced. Some of the others flew out of the collet held in a Dremel Moto Tool 'cause they were so unbalanced.</p><p></p><p>Several (more than 5 or 6) sub 1.5 inch groups were fired, each starting with a cold barrel. They ranged from 1.5 down to about 0.7 inch. These "perfect bullets" fired in this test was the best thing done to show that best accuracy doesn't have to come from "perfect concentric actions" and "perfect cases." As long as the barrel, action and stock behave in their mechanical motion the same for each shot, best accuracy will prevail.</p><p></p><p>When someone proves that these new fangled solid round or square "perfect" actions made these days have to be used to shoot good bullets that well, they may have a point proven. Meanwhile, nobody's done that well since and maybe nobody ever will.</p></blockquote><p></p>
[QUOTE="Bart B, post: 518629, member: 5302"] I don't think actions and cases have to be perfect. Primers and powder charges aren't perfect; fixed amounts of their main ingredient causes muzzle velocity spreads. And cases don't have to be perfect; a couple thousandths spread in body and shoulder wall thickness doesn't matter. Case necks are fine if their thickness doesn't have more than half a thousndths spread; they can be fired in chambers with several thousandths clearance to the chamber neck and all shoot just fine. The smallest series of 10-shot test groups at 600 yards I know of were shot back in 1970. An old classic Win. 70 pre-64 action with a sloppy bolt fit that wasn't in perfect alignment with the barrel tenon thread axis was used, but the Hart barrel's bore, chamber and tenon axes were all in perfect alignment. And the receiver face as well as the bolt face were squared up with the chamber and tenon axes. Western WCC58 cases were used holding IMR4064 powder; I forget what primer was used. The FMJBT bullets used were spun at 30,000 rpm checking for ones that were perfectly balanced as indicated when current to the motor was steady at its lowest reading. Maybe 10 out of a box of 100 were so balanced. Some of the others flew out of the collet held in a Dremel Moto Tool 'cause they were so unbalanced. Several (more than 5 or 6) sub 1.5 inch groups were fired, each starting with a cold barrel. They ranged from 1.5 down to about 0.7 inch. These "perfect bullets" fired in this test was the best thing done to show that best accuracy doesn't have to come from "perfect concentric actions" and "perfect cases." As long as the barrel, action and stock behave in their mechanical motion the same for each shot, best accuracy will prevail. When someone proves that these new fangled solid round or square "perfect" actions made these days have to be used to shoot good bullets that well, they may have a point proven. Meanwhile, nobody's done that well since and maybe nobody ever will. [/QUOTE]
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