Re: 7 wsm vs 7 rsaum-- that is the ?
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better brass WSM,better suited for short action RSAUM,,I doubt either is much if any better than the 280AI.
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The SAUM actually has exactly the same case capacity as the .280AI. If you look in the Nosler #5 manual you'll see that the load data for the SAUM and .280AI are also nearly identical (as is velocity). One just functions out of a Short Action, the other doesn't.
Also, in regards to throating a WSM long to achieve better performance, I believe that is a misconception too. You can throat them longer to accept VLD style bullets and function out of the magazine... but increased velocity is not usually achieved. There's an article in Rifle magazine by Chub Eastman of Nosler where they chambered a barrel with the standard WSM reamer and then re-chambered it with a longer throat and saw virtually no increase in velocity. It would help to throat it long if you were designing it to shoot the heavier VLDs I guess, although I don't know how much. ~JT
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