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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
270-338 RUM
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<blockquote data-quote="Fiftydriver" data-source="post: 36863" data-attributes="member: 10"><p>7Ultra,</p><p></p><p>I am designing and releasing a family of rounds based on the 338 RUM case. They will include the 257, 6.5mm and 270.</p><p></p><p>My rounds named the Allen Magnums will be modified quite heavily compared to the standard 338 RUM parent case.</p><p></p><p>These rounds are being designed along with Richard Graves of Wildcat Bullets in Alberta Canada who is designing some very impressive bullets for these new rounds.</p><p></p><p>Just a few of them are the four new options for the 257 AM. A 130 gr Bonded Core FBHP, 145 gr FBSP, 150 gr FBHP and a 145 gr Rebated Boattail ULD design.</p><p></p><p>For the 6.5mm version there will be the 140 gr Bonded Core FBHP, a 160 gr class RBT ULD and this winter we will be designing a 180 gr ULD for the 6.5 AM.</p><p></p><p>The 270 version will also have new bullets but of more traditional weights such as 130 gr but also aome heavy 169 gr pills as well.</p><p></p><p>The AM case will be the largest practical case for thes rounds and substantially more then the parent case 338 RUM simply necked down.</p><p></p><p>The trick is to use heavy bullets to make this big case run hard.</p><p></p><p>About the 338 RUM having 120 gr of usable powder volume, this simply is not true by any means.</p><p></p><p>Comparing the 257 STW, 257 AM and the 25 RUM, the case capacities are as follows when filled to the case mouth with H-335:</p><p></p><p>STW: 104 gr</p><p>AM: 120 gr </p><p>RUM: 128 gr </p><p></p><p>Now if you compare usible powder capacity, its more like:</p><p></p><p>STW: 80 gr </p><p>AM: 95 gr</p><p>RUM: 105 gr</p><p></p><p>This is filled to the base of the neck. This is certainly alot of powder espeically if you plan on using light for caliber bullets but for the heavy for caliber bullets this case size will perform very well in a barrel length that you want to use.</p><p></p><p>My AM rounds are designed around 30" barrels.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 36863, member: 10"] 7Ultra, I am designing and releasing a family of rounds based on the 338 RUM case. They will include the 257, 6.5mm and 270. My rounds named the Allen Magnums will be modified quite heavily compared to the standard 338 RUM parent case. These rounds are being designed along with Richard Graves of Wildcat Bullets in Alberta Canada who is designing some very impressive bullets for these new rounds. Just a few of them are the four new options for the 257 AM. A 130 gr Bonded Core FBHP, 145 gr FBSP, 150 gr FBHP and a 145 gr Rebated Boattail ULD design. For the 6.5mm version there will be the 140 gr Bonded Core FBHP, a 160 gr class RBT ULD and this winter we will be designing a 180 gr ULD for the 6.5 AM. The 270 version will also have new bullets but of more traditional weights such as 130 gr but also aome heavy 169 gr pills as well. The AM case will be the largest practical case for thes rounds and substantially more then the parent case 338 RUM simply necked down. The trick is to use heavy bullets to make this big case run hard. About the 338 RUM having 120 gr of usable powder volume, this simply is not true by any means. Comparing the 257 STW, 257 AM and the 25 RUM, the case capacities are as follows when filled to the case mouth with H-335: STW: 104 gr AM: 120 gr RUM: 128 gr Now if you compare usible powder capacity, its more like: STW: 80 gr AM: 95 gr RUM: 105 gr This is filled to the base of the neck. This is certainly alot of powder espeically if you plan on using light for caliber bullets but for the heavy for caliber bullets this case size will perform very well in a barrel length that you want to use. My AM rounds are designed around 30" barrels. Good Shooting!! Kirby Allen(50) [/QUOTE]
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270-338 RUM
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