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<blockquote data-quote="specweldtom" data-source="post: 423143" data-attributes="member: 2580"><p>Yeah, from what I've read, I have the same impression of the A-bolt as a candidate for customizing. </p><p></p><p>I have no problem confusing the issue either. Have you thought about the .340 Wby on your .300 Wby donor? It's about 200 fps faster than the .338 Win Mag, and the ones I've had loved the 250gr Nosler Partition factory load. That combination is poison in a carry weight rifle. A muzzle brake is not necessary, but felt recoil is high in a light rifle. It won't hang with the RUM, but can get within 150 fps with the 250gr Nosler, and the aforementioned Barnes book shows the 2 cartridges in a dead heat with 200gr and 250gr Barnes bullets. Both the Nosler and Barnes books used 26" barrels for both cartridges. As barrel length increases, the RUM will pull away from the Wby with all bullet weights because of the greater powder capacity, but in a carry weight rifle, they are closer together. At 2800 fps muzzle velocity, the .340 (250gr Nosler) drops to 2000 ft/lbs at 510 yds, with 1900 fps retained velocity. At 800 yds it's down to 1300 ft/lbs and 1500 fps. Still supersonic, and accurate, but below the 2000 ft/lbs that has been recommended for Elk. Been wanting to do it because my home built .340 likes that bullet too. </p><p></p><p>I ran the .338 RUM at 2990 fps muzzle velocity and came up with 1477 ft/lbs at 800 yds with 1627 fps retained velocity. It drops to the 2000 ft/lb threshold at 600 yds, with 1930 fps retained velocity. Not nearly as much difference from the .340 as I expected. I got these numbers off my Oehler Ballistic Explorer. I ran them at 25' above sea level with 90% relative humidity and 70 deg F. The G1 ballistic coefficient of the 250gr Partition is .473.</p><p></p><p>How's that for muddying the water? Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 423143, member: 2580"] Yeah, from what I've read, I have the same impression of the A-bolt as a candidate for customizing. I have no problem confusing the issue either. Have you thought about the .340 Wby on your .300 Wby donor? It's about 200 fps faster than the .338 Win Mag, and the ones I've had loved the 250gr Nosler Partition factory load. That combination is poison in a carry weight rifle. A muzzle brake is not necessary, but felt recoil is high in a light rifle. It won't hang with the RUM, but can get within 150 fps with the 250gr Nosler, and the aforementioned Barnes book shows the 2 cartridges in a dead heat with 200gr and 250gr Barnes bullets. Both the Nosler and Barnes books used 26" barrels for both cartridges. As barrel length increases, the RUM will pull away from the Wby with all bullet weights because of the greater powder capacity, but in a carry weight rifle, they are closer together. At 2800 fps muzzle velocity, the .340 (250gr Nosler) drops to 2000 ft/lbs at 510 yds, with 1900 fps retained velocity. At 800 yds it's down to 1300 ft/lbs and 1500 fps. Still supersonic, and accurate, but below the 2000 ft/lbs that has been recommended for Elk. Been wanting to do it because my home built .340 likes that bullet too. I ran the .338 RUM at 2990 fps muzzle velocity and came up with 1477 ft/lbs at 800 yds with 1627 fps retained velocity. It drops to the 2000 ft/lb threshold at 600 yds, with 1930 fps retained velocity. Not nearly as much difference from the .340 as I expected. I got these numbers off my Oehler Ballistic Explorer. I ran them at 25' above sea level with 90% relative humidity and 70 deg F. The G1 ballistic coefficient of the 250gr Partition is .473. How's that for muddying the water? Tom [/QUOTE]
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