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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="PeterBH" data-source="post: 1025890" data-attributes="member: 86580"><p>I like both guns, but I have much more experience with the Weatherby. I make custom guns and have made many in the Keith Thompson version of the 338/378 because it fits more actions. I am curious why W'by loads their round so lightly, namely, 3050 fps with a 250 gr bullet. I have loaded the KT version (with less powder capacity) to 3450 fps with a 250 grain bullet. Unfortunately, this is a barrel destroyer so I cut it back to 3250 FPS and suffer no ill effects. This is with a standard powder-nothing exotic. I won't give out the loads as someone might try a high load without gradually working their way up and carefully looking for high pressure effects.</p><p> Both rounds have been here a long time. W'by made 5 guns chambered for it in the 1960's. The first 4 were called the 338'378 W'by and the 5th gun that year was called the 340/378 although it was the same cartridge. A friend actually owns one of the former. I have heard both it and the 300/378 were developed to satisfy a govt request although they went nowhere until more appropriate powders were developed. I don't know if the KT or W'by was developed first, but think they came out about the same time.</p></blockquote><p></p>
[QUOTE="PeterBH, post: 1025890, member: 86580"] I like both guns, but I have much more experience with the Weatherby. I make custom guns and have made many in the Keith Thompson version of the 338/378 because it fits more actions. I am curious why W'by loads their round so lightly, namely, 3050 fps with a 250 gr bullet. I have loaded the KT version (with less powder capacity) to 3450 fps with a 250 grain bullet. Unfortunately, this is a barrel destroyer so I cut it back to 3250 FPS and suffer no ill effects. This is with a standard powder-nothing exotic. I won't give out the loads as someone might try a high load without gradually working their way up and carefully looking for high pressure effects. Both rounds have been here a long time. W'by made 5 guns chambered for it in the 1960's. The first 4 were called the 338'378 W'by and the 5th gun that year was called the 340/378 although it was the same cartridge. A friend actually owns one of the former. I have heard both it and the 300/378 were developed to satisfy a govt request although they went nowhere until more appropriate powders were developed. I don't know if the KT or W'by was developed first, but think they came out about the same time. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 lapua v. 338-378 weatherby
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