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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 PRC Build . . . What twist rate are you finding successful?
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<blockquote data-quote="LeddSlinger" data-source="post: 2037736" data-attributes="member: 65338"><p>Do not do a 1 in 8" twist. </p><p></p><p>My first 300 Norma Improved had an 8" twist and it was hard to load for. Over turning the bullets made the barrel very picky. Went with 8" because I wanted to shoot the new Sierra 230s. Of course Berger shot better so now I was over twisting the Bergers. Big mistake.</p><p></p><p>Next barrel was a 1 in 9". Shoots good with the Berger 220gr LR Hybrid but when I pushed speeds over 3200 fps, I had a bullet fly apart in mid flight during load development. Again too much stress on the bullet jacket. Had to back it off to 3175 fps.</p><p></p><p>My next barrel will be a 1 in 10" twist because the 220gr Berger is my favorite bullet so far and do not plan to shoot anything else. 10" twist will allow me to get up over 3200 fps without any issues.</p><p></p><p>Moral of the story: Do NOT over twist bullets. If a 9" or 10" is all that's required by the manufacturer for the bullet you want to shoot, then go with that twist. No reason to go tighter unless you are shooting really low muzzle velocities. </p><p></p><p>***Shooting at an elevation of around 3700 ft. Used to load test at 500 yards but have recently started testing all my loads at 635 yards. I don't shoot loads at shorter ranges because I feel the farther out you can test will give you much more valuable information on the characteristics of each load.</p></blockquote><p></p>
[QUOTE="LeddSlinger, post: 2037736, member: 65338"] Do not do a 1 in 8” twist. My first 300 Norma Improved had an 8” twist and it was hard to load for. Over turning the bullets made the barrel very picky. Went with 8” because I wanted to shoot the new Sierra 230s. Of course Berger shot better so now I was over twisting the Bergers. Big mistake. Next barrel was a 1 in 9”. Shoots good with the Berger 220gr LR Hybrid but when I pushed speeds over 3200 fps, I had a bullet fly apart in mid flight during load development. Again too much stress on the bullet jacket. Had to back it off to 3175 fps. My next barrel will be a 1 in 10” twist because the 220gr Berger is my favorite bullet so far and do not plan to shoot anything else. 10” twist will allow me to get up over 3200 fps without any issues. Moral of the story: Do NOT over twist bullets. If a 9” or 10” is all that’s required by the manufacturer for the bullet you want to shoot, then go with that twist. No reason to go tighter unless you are shooting really low muzzle velocities. ***Shooting at an elevation of around 3700 ft. Used to load test at 500 yards but have recently started testing all my loads at 635 yards. I don’t shoot loads at shorter ranges because I feel the farther out you can test will give you much more valuable information on the characteristics of each load. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
300 PRC Build . . . What twist rate are you finding successful?
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