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Rifles, Reloading, Optics, Equipment
Reloading
308 SMK Load
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<blockquote data-quote="Bart B" data-source="post: 562470" data-attributes="member: 5302"><p>J-man, we probably thought you meant the es/sd that was the most consistant was the one to use for best accuracy. If you meant the best accuracy as being the most consistant, then that's different and a good thing to do.</p><p></p><p>I don't think shooting 10 shots very quickly results in much human error if the rifle's fired in free recoil. And that's how most benchrest rifles are fired these days; especially the 20-pound and heavier ones shooting the big .300's.</p><p></p><p>Here's some examples....</p><p></p><p>That 155-gr. Sierra bullet load for the .308 Win. I helped develop was loaded on two Dillon 1050 progressives. One sized down the new case necks at one station, opened up at the next station with an old Lyman expander die to have a medium grip on the bullet when they were seated and seated a Fed. 210M primer in the last station. The second 1050 metered 45.3 grains of IMR 4895 (3/10ths grain spread) at one station and seated the bullet and another one. 23 rounds at random were taken to a 600 yard test range where the Win. 70 based Palma rifle was clamped in a machine rest; it had a 3 point suspension and was perfectly repeatable within 1/50th MOA. Two or three sighters were fired to center the group on a test target. 20 shots for testing were fired, each about 20 seconds apart. All 20 went into 2.7 inches at 600 yards. A picture of that group's in a fall 1991 issue of Handloader magazine. Compare that group to the current 600 yard benchrest aggregate records. </p><p></p><p>A friend fired several 10-shot groups at 600 yards using bullets that had been spin tested for balance; only those with perfect balance were used. All cases were full length sized and fired in another Win. 70 with a Hart barrel. They all were under 1.5 inches; smaller ones were under an inch. All shots fired 20 seconds apart. Another test with the same timing, rifle and ammo had 40 consecutive shots fired into 1.92 inch.</p><p></p><p>Shooting fast has the advantage of getting ones shots off when the wind's constant (zero is preferred). Good rifles don't change point of impact as their barrel heats up. Just get the shot off within 10 to 15 seconds of chambering it so the powder doesn't heat up enough to make the shot go high.</p></blockquote><p></p>
[QUOTE="Bart B, post: 562470, member: 5302"] J-man, we probably thought you meant the es/sd that was the most consistant was the one to use for best accuracy. If you meant the best accuracy as being the most consistant, then that's different and a good thing to do. I don't think shooting 10 shots very quickly results in much human error if the rifle's fired in free recoil. And that's how most benchrest rifles are fired these days; especially the 20-pound and heavier ones shooting the big .300's. Here's some examples.... That 155-gr. Sierra bullet load for the .308 Win. I helped develop was loaded on two Dillon 1050 progressives. One sized down the new case necks at one station, opened up at the next station with an old Lyman expander die to have a medium grip on the bullet when they were seated and seated a Fed. 210M primer in the last station. The second 1050 metered 45.3 grains of IMR 4895 (3/10ths grain spread) at one station and seated the bullet and another one. 23 rounds at random were taken to a 600 yard test range where the Win. 70 based Palma rifle was clamped in a machine rest; it had a 3 point suspension and was perfectly repeatable within 1/50th MOA. Two or three sighters were fired to center the group on a test target. 20 shots for testing were fired, each about 20 seconds apart. All 20 went into 2.7 inches at 600 yards. A picture of that group's in a fall 1991 issue of Handloader magazine. Compare that group to the current 600 yard benchrest aggregate records. A friend fired several 10-shot groups at 600 yards using bullets that had been spin tested for balance; only those with perfect balance were used. All cases were full length sized and fired in another Win. 70 with a Hart barrel. They all were under 1.5 inches; smaller ones were under an inch. All shots fired 20 seconds apart. Another test with the same timing, rifle and ammo had 40 consecutive shots fired into 1.92 inch. Shooting fast has the advantage of getting ones shots off when the wind's constant (zero is preferred). Good rifles don't change point of impact as their barrel heats up. Just get the shot off within 10 to 15 seconds of chambering it so the powder doesn't heat up enough to make the shot go high. [/QUOTE]
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