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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Recommendations
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<blockquote data-quote="sable tireur" data-source="post: 2723932" data-attributes="member: 27307"><p>Yes, I know this is a few months old but I thought of a little relevant information which might prove useful in whatever small way.</p><p></p><p>I mentioned in the opening responses about using the .257 Weatherby Extended Range ammunition which was loaded with a Spitzer Boat Tail bullet:</p><p></p><p>[ATTACH=full]431191[/ATTACH]</p><p></p><p>The bullet in the .257 Weatherby was the 122 gr. SP Extended Range bullet. I had a couple of these rifles to test so as usual I bought some factory ammunition to use as a baseline. </p><p></p><p>The twist rate in both cut rifled barrels was a measured 1:10" which should have been adequate. One was 22" the other 26 inches.</p><p></p><p>Shooting the 22" first resulted in an anomaly which I thought the spotting scope was creating so I walked to the 100 yard target to observe close up that the impact on paper was showing a light elongation. I walked back and proceeded to shoot the 26" barrel. Same elongated hole in the paper. Thinking all manner of things may have occurred, I moved the target to 300 yards. This resulted in the same elongated holes and not even close to a decent group. Well poop!</p><p></p><p>I called Remington, had a very nice albeit short discussion and wound up faxing them targets. (Yes, before smartphones...) End thinking was that these should need a 1:9" twist and not 1:10" as suggested on the box. This was all long before the 131 Ace and the 133/135 Berger bullets. </p><p></p><p>Now I use 1:7.5" for everything .25 caliber and do not see failures with the cup and core bullets as has been suggested. Maybe I'm just special?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>Nah.</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="sable tireur, post: 2723932, member: 27307"] Yes, I know this is a few months old but I thought of a little relevant information which might prove useful in whatever small way. I mentioned in the opening responses about using the .257 Weatherby Extended Range ammunition which was loaded with a Spitzer Boat Tail bullet: [ATTACH type="full"]431191[/ATTACH] The bullet in the .257 Weatherby was the 122 gr. SP Extended Range bullet. I had a couple of these rifles to test so as usual I bought some factory ammunition to use as a baseline. The twist rate in both cut rifled barrels was a measured 1:10" which should have been adequate. One was 22" the other 26 inches. Shooting the 22" first resulted in an anomaly which I thought the spotting scope was creating so I walked to the 100 yard target to observe close up that the impact on paper was showing a light elongation. I walked back and proceeded to shoot the 26" barrel. Same elongated hole in the paper. Thinking all manner of things may have occurred, I moved the target to 300 yards. This resulted in the same elongated holes and not even close to a decent group. Well poop! I called Remington, had a very nice albeit short discussion and wound up faxing them targets. (Yes, before smartphones...) End thinking was that these should need a 1:9" twist and not 1:10" as suggested on the box. This was all long before the 131 Ace and the 133/135 Berger bullets. Now I use 1:7.5" for everything .25 caliber and do not see failures with the cup and core bullets as has been suggested. Maybe I'm just special?:D Nah. ;) [/QUOTE]
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