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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New .338 lanches a 300gr Sierra MK at 3500fps?
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<blockquote data-quote="Steve Shelp" data-source="post: 21916" data-attributes="member: 22"><p>Brent,</p><p> I just laid out my 338 Lapua case from a sectioned case I have out of my chamber. Moved the shoulder foward another .015", left the taper alone as they extract very nicely even when hot load are fired. Depending on whether you want a 35 degree or go to the 40 degree shoulder you could end up between 123-125gr of H2O approx. </p><p></p><p>So to review what is already known: My current case holds 120.5gr of H2O. Has produced 3165fps in a 45" barrel with R25 (in one rifle!!) with a 96gr load accurately. This 45" barreled rifle and mine have both fired up to 98gr of R25 but it was on the hot side in summer time temps. Don't have the chrono numbers for the 98gr load though.</p><p></p><p>So if you use slower burning powders with the current case or any amount of case capacity increase you should be able to get 3200fps easily in a long barrel. How much over 3200fps would be guessing. </p><p> But Darryl has a point about 5-7 firings of 100 cases. Are you going to be able to push 3300fps with the Lapua case, I'd say that's probably stretching it, but you never know. You've got my curiousity up. Wish I was in the position to do this myself just to see.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 21916, member: 22"] Brent, I just laid out my 338 Lapua case from a sectioned case I have out of my chamber. Moved the shoulder foward another .015", left the taper alone as they extract very nicely even when hot load are fired. Depending on whether you want a 35 degree or go to the 40 degree shoulder you could end up between 123-125gr of H2O approx. So to review what is already known: My current case holds 120.5gr of H2O. Has produced 3165fps in a 45" barrel with R25 (in one rifle!!) with a 96gr load accurately. This 45" barreled rifle and mine have both fired up to 98gr of R25 but it was on the hot side in summer time temps. Don't have the chrono numbers for the 98gr load though. So if you use slower burning powders with the current case or any amount of case capacity increase you should be able to get 3200fps easily in a long barrel. How much over 3200fps would be guessing. But Darryl has a point about 5-7 firings of 100 cases. Are you going to be able to push 3300fps with the Lapua case, I'd say that's probably stretching it, but you never know. You've got my curiousity up. Wish I was in the position to do this myself just to see. Steve [/QUOTE]
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New .338 lanches a 300gr Sierra MK at 3500fps?
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