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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?
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<blockquote data-quote="edward hogan" data-source="post: 300734" data-attributes="member: 1341"><p>Velocity is not the end-all solution for longrange shooting. Case in point, the .338Whisper is pretty well regarded for accuracy and ability to deliver a heavy high BC bullet. Kinda like the .338/300 for its ability to cover a wider spectrum of load potential than other rounds that are magnums. I do have some other slow-burning powders that might raise the velocity, but why?</p><p></p><p>I've found that medium velocity loads tend to be more conducive to accuracy Talk to the techs at Sierra about how promptly max-load magnums burn up their barrels. Then consider the chamber dynamics and minimum oal as discussed. A benchrest smith might set a 6mmPPC chamber to be .0005" longer than SAAMI specifications. Not talking about neck-turning tight chambers.</p><p></p><p>3400fps with a 300gr bullet is damned awesome but, how much difference does it make out past 1000yds compared to the same bullet started at 700fps slower? (Not saying I can generate 2700fps w/300gr bullet, but if both are zeroed at 300yds the 3400fps bullet has lost 300fps of its initial advantage over the 2700fps round. Sure trajectory is more rainbowlike, but 18moa versus 30moa is not a big deal.</p><p></p><p>At 2000yds, I don't know... What I do know is flat shooting is out the window for either round and it all comes down to scope come-ups at that distance. That plus chamber dynamics and inherent accuracy.</p><p></p><p>The .338/300 is only about 100fps shy of the .338rum, but can be moderately loaded, which rum and full-sized H&H cases like the Weatherby cannot. In the .338/300 you gain 5 grains of capacity over the .338win, and have (in the Sako M995 action) a gain of almost half an inch of magazine space in which to seat your bullet. ETA: compared to the .340wby which is .205 longer than the .300win case.</p><p></p><p>Maybe the Chey-Tac sized actions have over 1.25" of room to work with when seating bullets, but no others have as much as the Sako M995, (3.75" inside magazine oal) I am pretty sure.</p><p></p><p>If you are chasing the velocity demon, there are other powders. I see a lot of endorsements for H4350 in the 6mmXC. I have a 6mm/.22-250AI which is about the same thing, but for AR-10. I might try XMR4350 in that match upper since it has an extra length gas tube and XMR is definitely the mildest of the 4350 burn rate powders. </p><p></p><p>A better fill-rate producing a bit less in pressure & velocity will likely be more conducive to accuracy.</p><p></p><p>With a hellacious powerful scope and 100 moa of elevation, maybe at 2000yds the .338/300 could compete? If a .338Whisper can deliver contending accuracy at 400-500yds, aside from some need to own The Hammer of Thor what serves you better? The target at 2000yds can't distinguish from a 1000fps delivery or an 1100fps delivery.</p><p></p><p></p><p>ETA: Topshot; I didn't even think about velocity gains due to barrel length. The numbers I cited were just extrapolations from Barnes and Nosler manuals, plus the Accurate Arms loading manual. I will also state that I am growing of the opinion that longer barrels are not intrinsic aids to accuracy. 22" may actually be about the optimum length for barrel harmonics, otherwise why is 20-22" so popular with benchresters? Terrain in my area is dense sub-arctic almost jungle, and I carry and still hunt with my rifles. Maybe a 24" is optimum for a sub H&H case like mine, I don't know. Just know 26" balances pretty decent, but shorter barrel would carry more easily on a sling.</p></blockquote><p></p>
[QUOTE="edward hogan, post: 300734, member: 1341"] Velocity is not the end-all solution for longrange shooting. Case in point, the .338Whisper is pretty well regarded for accuracy and ability to deliver a heavy high BC bullet. Kinda like the .338/300 for its ability to cover a wider spectrum of load potential than other rounds that are magnums. I do have some other slow-burning powders that might raise the velocity, but why? I've found that medium velocity loads tend to be more conducive to accuracy Talk to the techs at Sierra about how promptly max-load magnums burn up their barrels. Then consider the chamber dynamics and minimum oal as discussed. A benchrest smith might set a 6mmPPC chamber to be .0005" longer than SAAMI specifications. Not talking about neck-turning tight chambers. 3400fps with a 300gr bullet is damned awesome but, how much difference does it make out past 1000yds compared to the same bullet started at 700fps slower? (Not saying I can generate 2700fps w/300gr bullet, but if both are zeroed at 300yds the 3400fps bullet has lost 300fps of its initial advantage over the 2700fps round. Sure trajectory is more rainbowlike, but 18moa versus 30moa is not a big deal. At 2000yds, I don't know... What I do know is flat shooting is out the window for either round and it all comes down to scope come-ups at that distance. That plus chamber dynamics and inherent accuracy. The .338/300 is only about 100fps shy of the .338rum, but can be moderately loaded, which rum and full-sized H&H cases like the Weatherby cannot. In the .338/300 you gain 5 grains of capacity over the .338win, and have (in the Sako M995 action) a gain of almost half an inch of magazine space in which to seat your bullet. ETA: compared to the .340wby which is .205 longer than the .300win case. Maybe the Chey-Tac sized actions have over 1.25" of room to work with when seating bullets, but no others have as much as the Sako M995, (3.75" inside magazine oal) I am pretty sure. If you are chasing the velocity demon, there are other powders. I see a lot of endorsements for H4350 in the 6mmXC. I have a 6mm/.22-250AI which is about the same thing, but for AR-10. I might try XMR4350 in that match upper since it has an extra length gas tube and XMR is definitely the mildest of the 4350 burn rate powders. A better fill-rate producing a bit less in pressure & velocity will likely be more conducive to accuracy. With a hellacious powerful scope and 100 moa of elevation, maybe at 2000yds the .338/300 could compete? If a .338Whisper can deliver contending accuracy at 400-500yds, aside from some need to own The Hammer of Thor what serves you better? The target at 2000yds can't distinguish from a 1000fps delivery or an 1100fps delivery. ETA: Topshot; I didn't even think about velocity gains due to barrel length. The numbers I cited were just extrapolations from Barnes and Nosler manuals, plus the Accurate Arms loading manual. I will also state that I am growing of the opinion that longer barrels are not intrinsic aids to accuracy. 22" may actually be about the optimum length for barrel harmonics, otherwise why is 20-22" so popular with benchresters? Terrain in my area is dense sub-arctic almost jungle, and I carry and still hunt with my rifles. Maybe a 24" is optimum for a sub H&H case like mine, I don't know. Just know 26" balances pretty decent, but shorter barrel would carry more easily on a sling. [/QUOTE]
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338 Allen vs. 338 Snipe tac vs. 338 XT - Which one?
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