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Long Range Hunting & Shooting
338 Lapua Mag or 338 RUM
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 440755" data-attributes="member: 505"><p>Both are equally accurate. I just pulled up data for two 338 RUM's and two 338 Lapuas with 30" barrels that I built and tested at my shop. All four had excellent accuracy to about 2830 fps with the 300 smk (varied slightly between guns). I have been able to run velocities just a little faster overall with the Lapua probably because the lapua brass would load to higher pressures. But basically the 338 RUM, 338-300 RUM or edge on here and 338 Lapua are identical in accuracy and performance. Overall if you want to push them to the max I have been able to get just a little more velocity out of the 338 Lapua than the other two probably because the Lapua brass will take higher pressures. 90% of these are going to max out with best accuracy between 2750-2850 fps.</p><p> </p><p>The Lapua may be more expensive to build because of the action it requires and will be more expensive to shoot with the brass. I agree with others that I would consider the 338 Lapua imp at the minimum if you are doing a custom action. The ultramags are great if you have a donor standard magnum action to save some cash but if you are going custom then look for more bang for your buck. Improved versions of the 338-378 wby case and A'square's 338 Excalibur can give you 200-300 fps over the standard Lapua and ultramag based cartridges easily pushing the 300 smk well over 3000 fps. All are accurate and fun to shoot. A 300 smk at 3100 fps is way fun to shoot at extreme long range over 1000 yards.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 440755, member: 505"] Both are equally accurate. I just pulled up data for two 338 RUM's and two 338 Lapuas with 30" barrels that I built and tested at my shop. All four had excellent accuracy to about 2830 fps with the 300 smk (varied slightly between guns). I have been able to run velocities just a little faster overall with the Lapua probably because the lapua brass would load to higher pressures. But basically the 338 RUM, 338-300 RUM or edge on here and 338 Lapua are identical in accuracy and performance. Overall if you want to push them to the max I have been able to get just a little more velocity out of the 338 Lapua than the other two probably because the Lapua brass will take higher pressures. 90% of these are going to max out with best accuracy between 2750-2850 fps. The Lapua may be more expensive to build because of the action it requires and will be more expensive to shoot with the brass. I agree with others that I would consider the 338 Lapua imp at the minimum if you are doing a custom action. The ultramags are great if you have a donor standard magnum action to save some cash but if you are going custom then look for more bang for your buck. Improved versions of the 338-378 wby case and A'square's 338 Excalibur can give you 200-300 fps over the standard Lapua and ultramag based cartridges easily pushing the 300 smk well over 3000 fps. All are accurate and fun to shoot. A 300 smk at 3100 fps is way fun to shoot at extreme long range over 1000 yards. [/QUOTE]
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338 Lapua Mag or 338 RUM
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