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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Is there a 130gr bullet in .257 cal
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<blockquote data-quote="brianwinzor" data-source="post: 691071" data-attributes="member: 1067"><p>Paul, I am in the dark as to whether Wildcat bullets will be available again, and I just noticed that their website is still under development.</p><p></p><p>Richard Graves the original owner of Wildcat bullets never had the time to do any specific testing to ascertain the ballistic coefficient of his bullets. </p><p></p><p>I remember Kirby Allen after performing drop tests at various ranges, estimated that the bc of the 257 cal 156 grain uld was about .810. I only tried this bullet on a target out to 450 yards, and didn't perform a similar test, but this bullet when fired in my 257 Weatherby was definitely the best performer in the wind that I have ever used in the field. This bullet is 1.545 inches in length, so a bc of .750 and above would not surprise me. </p><p></p><p>I have listed the lengths of the various 257 cal bullets that I used to give you a comparison.</p><p></p><p>100 grain Nosler BT - 1.115 inches</p><p>115 grain Nosler BT - 1.204 inches</p><p>125 grain Wildcat Uld- 1.268 inches</p><p>130 grain Wildcat BCFBHP - 1.220 inches</p><p>142 grain Wildcat ULD - 1.365 inches</p><p>156 grain Wildcat ULD - 1.545 inches.</p><p></p><p>What did I learn from my .257 Weatherby with 7 twist barrel experiment? </p><p>(1) If heavy bullets of similar weight (125 - 156 grains) became available again, I doubt whether I would use the .257 Weatherby case, especially if I was plannning to mainly use the 156 grain bullet for my field loads. </p><p></p><p>The main problem with the 257W case is that there are not any powders slow enough currently available when using the 156 grain bullet to give the loading density that I prefer. (at least 90%) A maximum load of 69.0 grains of H870 with this bullet only achieves a load density of 81%, which leaves a lot of air space in a large case. </p><p></p><p>The comparison with 25/06AI highlights the difference when using the 156 grain bullet.</p><p>The 257 W with a 26 inch barrel used 69 grains H870 to produce 2,881 fps (load density 81%)</p><p>The 25/06AI with 24 inch barrel used 63 grains H870 to produce 2,832 fps (load density close to 100%. </p><p></p><p>If the 25/06 AI had a 26 inch barrel the velocity difference would be neglible. So next time I would either use this case or look at using a slightly larger case with the a capacity of about 75 - 80 grains. </p><p></p><p>(2) I also learnt that the 7 twist barrel needed to stabilise the long 156 grain bullet, put too much stress on the Wildcat 125 and 142 grain ULDs, and their j4 jackets where shredded causing the bullets to fragment. Consequently, these 125 and 142 bullets probably could only be used in a 8 or 9 twist barrel</p><p></p><p>Surprisingly, both the 100 and 115 grain Nosler Ballistic Tips withstood the incredible rotational stress and held together when fired in the 7 twist barrel. They must be very stout bullets.</p><p></p><p>Overall, I believe the testing confirmed that if heavier bullets with the appropriate construction in the 125 - 150 grain range were available again, then the 257 calibre could easily become a viable long range alternative.</p><p></p><p>Hope the above is of some help. Brian</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 691071, member: 1067"] Paul, I am in the dark as to whether Wildcat bullets will be available again, and I just noticed that their website is still under development. Richard Graves the original owner of Wildcat bullets never had the time to do any specific testing to ascertain the ballistic coefficient of his bullets. I remember Kirby Allen after performing drop tests at various ranges, estimated that the bc of the 257 cal 156 grain uld was about .810. I only tried this bullet on a target out to 450 yards, and didn't perform a similar test, but this bullet when fired in my 257 Weatherby was definitely the best performer in the wind that I have ever used in the field. This bullet is 1.545 inches in length, so a bc of .750 and above would not surprise me. I have listed the lengths of the various 257 cal bullets that I used to give you a comparison. 100 grain Nosler BT - 1.115 inches 115 grain Nosler BT - 1.204 inches 125 grain Wildcat Uld- 1.268 inches 130 grain Wildcat BCFBHP - 1.220 inches 142 grain Wildcat ULD - 1.365 inches 156 grain Wildcat ULD - 1.545 inches. What did I learn from my .257 Weatherby with 7 twist barrel experiment? (1) If heavy bullets of similar weight (125 - 156 grains) became available again, I doubt whether I would use the .257 Weatherby case, especially if I was plannning to mainly use the 156 grain bullet for my field loads. The main problem with the 257W case is that there are not any powders slow enough currently available when using the 156 grain bullet to give the loading density that I prefer. (at least 90%) A maximum load of 69.0 grains of H870 with this bullet only achieves a load density of 81%, which leaves a lot of air space in a large case. The comparison with 25/06AI highlights the difference when using the 156 grain bullet. The 257 W with a 26 inch barrel used 69 grains H870 to produce 2,881 fps (load density 81%) The 25/06AI with 24 inch barrel used 63 grains H870 to produce 2,832 fps (load density close to 100%. If the 25/06 AI had a 26 inch barrel the velocity difference would be neglible. So next time I would either use this case or look at using a slightly larger case with the a capacity of about 75 - 80 grains. (2) I also learnt that the 7 twist barrel needed to stabilise the long 156 grain bullet, put too much stress on the Wildcat 125 and 142 grain ULDs, and their j4 jackets where shredded causing the bullets to fragment. Consequently, these 125 and 142 bullets probably could only be used in a 8 or 9 twist barrel Surprisingly, both the 100 and 115 grain Nosler Ballistic Tips withstood the incredible rotational stress and held together when fired in the 7 twist barrel. They must be very stout bullets. Overall, I believe the testing confirmed that if heavier bullets with the appropriate construction in the 125 - 150 grain range were available again, then the 257 calibre could easily become a viable long range alternative. Hope the above is of some help. Brian [/QUOTE]
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Is there a 130gr bullet in .257 cal
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