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Long Range Hunting & Shooting
300 WM vs. 300 WSM
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<blockquote data-quote="3006savage" data-source="post: 292063" data-attributes="member: 12069"><p>The 300 WSM competes very well with the WM due to its higher percentage of useable case capacity. When you look at the cartridge designs side by side you will see it is actually the WM that runs into case incringment problems first. I think too much is being made of the short fat case vs the traditional case.</p><p> </p><p>The WSM SAMMI OAL is 2.86 and the case length is 2.1". That means .76 inches of bullet can be set outside of the case and no capacity is lost. The wm by comparison has an OAL of 3.3402 and the case length is 2.6201. That means only .72 inches of bullet can be set out of the case before case capacity is lost.</p><p> </p><p>When you look at the dimesion beyond the neck and to the case itself the WSM actually has a bigger advantage. the distance from max OAL to where the shoulder starts on the WSM is 1.058 inches vs only .984 for the WM.</p><p> </p><p>Due to its longer case the WM case gives up slightly less capacity than the WSM does when bullets encroach into the case below the shoulder. With long bullets this can negate the WSM advantage in useable capacity.</p><p> </p><p>If you pick the right action, magazine, and throat the barrel to allow the bullets to set out of the case the WSM will run right with the WM over a broad range of bulletweights and lengths because it is useable capacity that really matters. That being said if your action will allow you to do the same with the WM with its 10 grain case capacity advantage and it will be 75 to 100 fps faster. </p><p> </p><p>My personal choice would be a WSM chambered rifle that could feed rounds 3.1 to 3.2 inches long to handle high BC 180s and 200s.</p></blockquote><p></p>
[QUOTE="3006savage, post: 292063, member: 12069"] The 300 WSM competes very well with the WM due to its higher percentage of useable case capacity. When you look at the cartridge designs side by side you will see it is actually the WM that runs into case incringment problems first. I think too much is being made of the short fat case vs the traditional case. The WSM SAMMI OAL is 2.86 and the case length is 2.1". That means .76 inches of bullet can be set outside of the case and no capacity is lost. The wm by comparison has an OAL of 3.3402 and the case length is 2.6201. That means only .72 inches of bullet can be set out of the case before case capacity is lost. When you look at the dimesion beyond the neck and to the case itself the WSM actually has a bigger advantage. the distance from max OAL to where the shoulder starts on the WSM is 1.058 inches vs only .984 for the WM. Due to its longer case the WM case gives up slightly less capacity than the WSM does when bullets encroach into the case below the shoulder. With long bullets this can negate the WSM advantage in useable capacity. If you pick the right action, magazine, and throat the barrel to allow the bullets to set out of the case the WSM will run right with the WM over a broad range of bulletweights and lengths because it is useable capacity that really matters. That being said if your action will allow you to do the same with the WM with its 10 grain case capacity advantage and it will be 75 to 100 fps faster. My personal choice would be a WSM chambered rifle that could feed rounds 3.1 to 3.2 inches long to handle high BC 180s and 200s. [/QUOTE]
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300 WM vs. 300 WSM
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