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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Too fast twist rate?
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<blockquote data-quote="AZShooter" data-source="post: 1279141" data-attributes="member: 5219"><p>There is certainly a situation where too much twist can cause issues. I was actually warned by guys here NOT to do it.</p><p></p><p> I had excellent results with a 3 groove in 257 that when I decided to build a 30" barreled 14 lb 7 Rem mag to shoot 180 Berger hunting VLDs, I again went to a 3 groove barrel. </p><p></p><p>I was using Lilja barrels at the time and the only 3 groove with a twist fast enough to stabilize the 180 was an offering 1 in 7. I asked Dan if it would be an issue and he answered no. I went ahead with the project. As the same time my friend built a 7 STW with another 1 in 7. </p><p></p><p>My friend's rifle began to have flyers at round count 175 or so. Mine did the same thing at round count 225. Unfortunately it happed the first time while shooting at a coues wt! It was poorly hit and I couldn't hit it again with the next five shots!!! I borrowed my friend's rifle and finished it off. </p><p></p><p>I began my testing at the range. Every few shots would have a bullet go more than 8" from POI at 100 yds! I talked to Bryan Litz and he said try the target versions. That worked for 50 or so rounds then same flyers. He suggested moly coating and that again helped for a while. </p><p></p><p>Lesson learned. Certainly the 3 groove was a big factor in creating this issue but if the twist was perhaps 1 in 8 or 1 in 8.5 I am certain the rifle would have shot accurately for a longer time.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1279141, member: 5219"] There is certainly a situation where too much twist can cause issues. I was actually warned by guys here NOT to do it. I had excellent results with a 3 groove in 257 that when I decided to build a 30" barreled 14 lb 7 Rem mag to shoot 180 Berger hunting VLDs, I again went to a 3 groove barrel. I was using Lilja barrels at the time and the only 3 groove with a twist fast enough to stabilize the 180 was an offering 1 in 7. I asked Dan if it would be an issue and he answered no. I went ahead with the project. As the same time my friend built a 7 STW with another 1 in 7. My friend's rifle began to have flyers at round count 175 or so. Mine did the same thing at round count 225. Unfortunately it happed the first time while shooting at a coues wt! It was poorly hit and I couldn't hit it again with the next five shots!!! I borrowed my friend's rifle and finished it off. I began my testing at the range. Every few shots would have a bullet go more than 8" from POI at 100 yds! I talked to Bryan Litz and he said try the target versions. That worked for 50 or so rounds then same flyers. He suggested moly coating and that again helped for a while. Lesson learned. Certainly the 3 groove was a big factor in creating this issue but if the twist was perhaps 1 in 8 or 1 in 8.5 I am certain the rifle would have shot accurately for a longer time. [/QUOTE]
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Too fast twist rate?
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