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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Published vs. Actual Ballistic Coef.?
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<blockquote data-quote="Fiftydriver" data-source="post: 72888" data-attributes="member: 10"><p>Derek M.</p><p></p><p>The 169.5 gr ULD Wildcat will require a 1-8 twist to be stabilized in any round especially the 270 Win and 270 Wby class.</p><p></p><p>I agree with Roy in Idaho that this bullet is to large for the 270 Win except for use as strictly a paper puncher at long range. In the 270 Wby class you start to get enough velocity to ensure expansion at some decent ranges.</p><p></p><p>Jump up to the 270 STW class round and it really starts to come into its own as youcan get into the 3100 to 3200 fps range with top loads.</p><p></p><p> <img src="http://www.hunt101.com/img/245370.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>This is a pic comparing the 130 gr Ballistic Tip to the 169.5 gr ULD RBBT Wildcat Bullets.</p><p></p><p> <img src="http://www.hunt101.com/img/293580.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>This pic compares the 270 Win(130 gr Ballistic Tip) on the left, 270 Allen Mag(169.5 gr ULD) middle and 7mm Rem Mag(140 gr Ballistic Silvertip) right.</p><p></p><p>Velocity performance of the three are as follows: </p><p></p><p>270 Win.........3100 fps w/ 130 gr BT</p><p>270 Allen Mag...3400 fps w/ 169.5 gr ULD</p><p>7mm Rem Mag.....3350 fps w/ 140 gr BST</p><p></p><p>Comparing apples to apples, the 270 Allen Mag will easily top 3850 fps with a 130 gr Ballistic Tip. Of course this is out of a 30" barrel but even given equal barrel lengths the Allen Mag will top the Win by +600 fps easily.</p><p></p><p>The 270 Allen Mag is based on a full length 7mm RUM case with the shoulder angle increased and body taper reduced to a very minimum. Case capacity of the 7mm RUM filled to the mouth with 8700 ball powder is 117 gr compared to 126 gr for the 270 Allen Mag.</p><p></p><p>The 270 Allen Mag capacity is slightly more then the 7.21 Firebird from Lazzeroni but it is able to be easily chambered in rifles such as the Rem 700 where as the Firebird is more difficult to squeeze into this size of receiver. It can certainly be done but at more expense then the 270 Allen Mag.</p><p></p><p>Cases are easy to form, run 7mm RUM cases through a 270 Allen Mag FL sizing die, prime, load, fireform, trim to length and your ready for serious performance.</p><p></p><p>The Allen Magnum rounds were designed for chambering in my Extreme Sporter rifles with barrel length of 28 to 30" and finished rifle weights ranging from 8.5 lbs to 11 lbs. They are also at home in heavier rifles as well but the goal was to offer the extreme in performance in a portable package and they have performed very well at that.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 72888, member: 10"] Derek M. The 169.5 gr ULD Wildcat will require a 1-8 twist to be stabilized in any round especially the 270 Win and 270 Wby class. I agree with Roy in Idaho that this bullet is to large for the 270 Win except for use as strictly a paper puncher at long range. In the 270 Wby class you start to get enough velocity to ensure expansion at some decent ranges. Jump up to the 270 STW class round and it really starts to come into its own as youcan get into the 3100 to 3200 fps range with top loads. [img]http://www.hunt101.com/img/245370.jpg[/img] This is a pic comparing the 130 gr Ballistic Tip to the 169.5 gr ULD RBBT Wildcat Bullets. [img]http://www.hunt101.com/img/293580.jpg[/img] This pic compares the 270 Win(130 gr Ballistic Tip) on the left, 270 Allen Mag(169.5 gr ULD) middle and 7mm Rem Mag(140 gr Ballistic Silvertip) right. Velocity performance of the three are as follows: 270 Win.........3100 fps w/ 130 gr BT 270 Allen Mag...3400 fps w/ 169.5 gr ULD 7mm Rem Mag.....3350 fps w/ 140 gr BST Comparing apples to apples, the 270 Allen Mag will easily top 3850 fps with a 130 gr Ballistic Tip. Of course this is out of a 30" barrel but even given equal barrel lengths the Allen Mag will top the Win by +600 fps easily. The 270 Allen Mag is based on a full length 7mm RUM case with the shoulder angle increased and body taper reduced to a very minimum. Case capacity of the 7mm RUM filled to the mouth with 8700 ball powder is 117 gr compared to 126 gr for the 270 Allen Mag. The 270 Allen Mag capacity is slightly more then the 7.21 Firebird from Lazzeroni but it is able to be easily chambered in rifles such as the Rem 700 where as the Firebird is more difficult to squeeze into this size of receiver. It can certainly be done but at more expense then the 270 Allen Mag. Cases are easy to form, run 7mm RUM cases through a 270 Allen Mag FL sizing die, prime, load, fireform, trim to length and your ready for serious performance. The Allen Magnum rounds were designed for chambering in my Extreme Sporter rifles with barrel length of 28 to 30" and finished rifle weights ranging from 8.5 lbs to 11 lbs. They are also at home in heavier rifles as well but the goal was to offer the extreme in performance in a portable package and they have performed very well at that. Good Shooting!! Kirby Allen(50) [/QUOTE]
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