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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Berger 180 Hybrid twist rate help
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<blockquote data-quote="Hicks" data-source="post: 466637" data-attributes="member: 9129"><p>This is not a rant on Berger. Great bullets! What I talk about here may be specific to my rifle, but I don't think so.</p><p></p><p>First of all, don't bother. The simple fact is that your bbl is not twisted tight enough to stabilize those bullets. I've been pretty vocal here about the tribulations I had trying to get these to shoot in my 7 RUM, with a factory 26" bbl and a twist rate of 9.5. I essentially destroyed the bbl in about 400 rounds (a guess). I tried every concievable configruation with seating depth, I tried H1000, 50BMG, US869 (I think that's the name of it, on Kirby's recommendation) Retumbo and something else I can't remember now. I did ladder test after ladder test, to no avail. I emailed Berger and the knowledgeable guy I talked to said that 9.5 was the marginal, and that 1 in 8 would be best. </p><p></p><p>Second of all, I went the "push it faster and the twist doesn't matter so much" route as well. I was getting about 3200fps with the 869, maybe a touch more, before I got pressure signs. That was as fast as it would go. Now, keep in mind that my dad has a factory .300 RUM that he has no problem pushing 220gr SMKs at 2950 - 3000 fps in 26" bbl, and it shoots clover leaves. </p><p></p><p></p><p>I bet I spent 300 dollars trying to get those bullets to shoot. I got ****ed and pulled the bbl. I'm going to make an Edge or something like it on the action. If I were to try a 7mm again and I wanted to shoot THOSE particular bullets, I would get a custom bbl, 30" finished, and twisted precisely to the Berger's specifications. In fact, and in hind sight, I could have bought a blank from a custom bbl maker for what I put into bullets and powder trying to get the Bergers to shoot. </p><p></p><p>Just my opinion.</p><p></p><p>Hicks</p></blockquote><p></p>
[QUOTE="Hicks, post: 466637, member: 9129"] This is not a rant on Berger. Great bullets! What I talk about here may be specific to my rifle, but I don't think so. First of all, don't bother. The simple fact is that your bbl is not twisted tight enough to stabilize those bullets. I've been pretty vocal here about the tribulations I had trying to get these to shoot in my 7 RUM, with a factory 26" bbl and a twist rate of 9.5. I essentially destroyed the bbl in about 400 rounds (a guess). I tried every concievable configruation with seating depth, I tried H1000, 50BMG, US869 (I think that's the name of it, on Kirby's recommendation) Retumbo and something else I can't remember now. I did ladder test after ladder test, to no avail. I emailed Berger and the knowledgeable guy I talked to said that 9.5 was the marginal, and that 1 in 8 would be best. Second of all, I went the "push it faster and the twist doesn't matter so much" route as well. I was getting about 3200fps with the 869, maybe a touch more, before I got pressure signs. That was as fast as it would go. Now, keep in mind that my dad has a factory .300 RUM that he has no problem pushing 220gr SMKs at 2950 - 3000 fps in 26" bbl, and it shoots clover leaves. I bet I spent 300 dollars trying to get those bullets to shoot. I got ****ed and pulled the bbl. I'm going to make an Edge or something like it on the action. If I were to try a 7mm again and I wanted to shoot THOSE particular bullets, I would get a custom bbl, 30" finished, and twisted precisely to the Berger's specifications. In fact, and in hind sight, I could have bought a blank from a custom bbl maker for what I put into bullets and powder trying to get the Bergers to shoot. Just my opinion. Hicks [/QUOTE]
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7mm Berger 180 Hybrid twist rate help
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