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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved 40 degree with print. Which design is better?
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<blockquote data-quote="Pdvdh" data-source="post: 1083053" data-attributes="member: 4191"><p>Not if you keep the LEAD restricted to 0.0005" over bullet diameter. Perhaps you'll experience additional throat erosion if you cut the LEAD 0.0015" over bullet diameter. The reason to go 0.0005" over bullet diameter is to prevent excess gas blowby, and to help ensure the bullet is precisely aligned with the bore as it enters the lands of the rifling. That's how it's been explained to me. And those explanations make sense.</p><p></p><p>I don't understand your reluctance to design a chamber and LEAD around a certain bullet when building a custom rifle. This member has already stated his intention of running 300gr Berger OTMs. That's a long bullet. Why wouldn't a guy lean toward a longer LEAD when intending to shoot one of the longest bullets manufactured in .338 caliber. Yes there's no guarantee the rifle will shoot the 300gr OTMs splendidly. Who's to know at the time of rifle design and construction. Sometimes the Bergers shoot well 0.010" off the lands. Sometimes they shoot better 0.080" off the lands. You'll never get 0.080" off the lands with a shortened LEAD without seating the bullet deep into the casing, needlessly consuming case capacity. If it won't shoot 300gr Berger OTMs, that doesn't mean it's to the scrap heap. Try the Sierra .338 300gr Match Kings or the Hornady .338 285gr A-Max, both of which are also long bullets. I surely didn't design my LEAD for 200-250gr .338 bullets for Long Range Hunting. I designed it for the higher BC (long) bullets in order to maximize retension of down range velocity and reduce wind drift at long ranges. If I wanted to proceed with a one-size fits all approach, I wouldn't have ordered a chamber reamer in the first place. Just go down to Walmart or Sportsman's Warehouse and order a factory rifle chambered in the standard .338 Lapua, designed to digest all factory ammo satisfactorily, and live with those average results. There's no guarantee it will shoot ANY bullet well, let alone the longest highest BC bullets currently marketed. That seems to be the more certain way of ending up with a disappointing rifle.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1083053, member: 4191"] Not if you keep the LEAD restricted to 0.0005" over bullet diameter. Perhaps you'll experience additional throat erosion if you cut the LEAD 0.0015" over bullet diameter. The reason to go 0.0005" over bullet diameter is to prevent excess gas blowby, and to help ensure the bullet is precisely aligned with the bore as it enters the lands of the rifling. That's how it's been explained to me. And those explanations make sense. I don't understand your reluctance to design a chamber and LEAD around a certain bullet when building a custom rifle. This member has already stated his intention of running 300gr Berger OTMs. That's a long bullet. Why wouldn't a guy lean toward a longer LEAD when intending to shoot one of the longest bullets manufactured in .338 caliber. Yes there's no guarantee the rifle will shoot the 300gr OTMs splendidly. Who's to know at the time of rifle design and construction. Sometimes the Bergers shoot well 0.010" off the lands. Sometimes they shoot better 0.080" off the lands. You'll never get 0.080" off the lands with a shortened LEAD without seating the bullet deep into the casing, needlessly consuming case capacity. If it won't shoot 300gr Berger OTMs, that doesn't mean it's to the scrap heap. Try the Sierra .338 300gr Match Kings or the Hornady .338 285gr A-Max, both of which are also long bullets. I surely didn't design my LEAD for 200-250gr .338 bullets for Long Range Hunting. I designed it for the higher BC (long) bullets in order to maximize retension of down range velocity and reduce wind drift at long ranges. If I wanted to proceed with a one-size fits all approach, I wouldn't have ordered a chamber reamer in the first place. Just go down to Walmart or Sportsman's Warehouse and order a factory rifle chambered in the standard .338 Lapua, designed to digest all factory ammo satisfactorily, and live with those average results. There's no guarantee it will shoot ANY bullet well, let alone the longest highest BC bullets currently marketed. That seems to be the more certain way of ending up with a disappointing rifle. [/QUOTE]
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338 Lapua Improved 40 degree with print. Which design is better?
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