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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 lapua v. 338-378 weatherby
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<blockquote data-quote="Fiftydriver" data-source="post: 56894" data-attributes="member: 10"><p>John M,</p><p></p><p>I agree with most of your comments about accuracy being the end all as far a long range performance goes but I will also say that in 26" or longer barrels when they are both loaded with the 300 gr ULD bullets, the 338-378 Wby will easily top the Lapua by 150 fps.</p><p></p><p>I have yet to see the 338 Lapua top 2900 fps with a 250 gr bullet in a 26" barrel without it being overloaded. Your 28" barrel will obviously produce more fps. The 338-378 Wby in an Accumark will hit 3075 fps with the 250s comfortably with the proper loading, in fact I have witnessed 3100 fps from the 338-378 Wby with decent case life. It was a hotter load then I would recommend but he was getting 5 firings per case so whatever I guess. </p><p></p><p>In 30" or longer barrels, the velocity advantage with these 300 gr ULD will be 200 fps.</p><p></p><p>With the lighter 250 gr class of bullets the Lapua does do pretty well in velocity but it is still a ways short of the 338-378.</p><p></p><p>As an example, my 338 Kahn will drive the 250 gr bullets to just shy of 3400 fps out of its 34.5" barrel. Figuring I would loose about 20 fps per inch of barrel which is probably more then I really would, that would be around 130 fps from just barrel length compared to your 28" barrel which would result in a velocity of +3250 fps or right at that 200 fps advantage. The Kahn is slightly larger in case capacity then the standard 338-378 but they are similiar.</p><p></p><p>Again though, you are correct that the rifle needs to be built to deliever teh accuracy needed for extreme range use or everything is wasted.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 56894, member: 10"] John M, I agree with most of your comments about accuracy being the end all as far a long range performance goes but I will also say that in 26" or longer barrels when they are both loaded with the 300 gr ULD bullets, the 338-378 Wby will easily top the Lapua by 150 fps. I have yet to see the 338 Lapua top 2900 fps with a 250 gr bullet in a 26" barrel without it being overloaded. Your 28" barrel will obviously produce more fps. The 338-378 Wby in an Accumark will hit 3075 fps with the 250s comfortably with the proper loading, in fact I have witnessed 3100 fps from the 338-378 Wby with decent case life. It was a hotter load then I would recommend but he was getting 5 firings per case so whatever I guess. In 30" or longer barrels, the velocity advantage with these 300 gr ULD will be 200 fps. With the lighter 250 gr class of bullets the Lapua does do pretty well in velocity but it is still a ways short of the 338-378. As an example, my 338 Kahn will drive the 250 gr bullets to just shy of 3400 fps out of its 34.5" barrel. Figuring I would loose about 20 fps per inch of barrel which is probably more then I really would, that would be around 130 fps from just barrel length compared to your 28" barrel which would result in a velocity of +3250 fps or right at that 200 fps advantage. The Kahn is slightly larger in case capacity then the standard 338-378 but they are similiar. Again though, you are correct that the rifle needs to be built to deliever teh accuracy needed for extreme range use or everything is wasted. Good Shooting!!! Kirby Allen [/QUOTE]
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338 lapua v. 338-378 weatherby
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