If you build a SAUM, based on it shooting the 180 vld at 2900 at 1/2 MOA, but for some reason that barrel wont shoot it well, what do you do?
>I would not build a SAUM to shoot 180g bullets. The WSM or Rem mag will do a better job.
With the 7 Rem mag, you are at least 150 Fps faster, so you have the same chance of it shooting well, but if it doesn't, you can move up a weight and still have a good short range trajectory. Or, you can go down a node, and still have most of what you wanted.
> My 7mm SAUM shoots 160g bullets at 3000 with several powders.
My 7mm Rem mag would only shoot them at 33 fps faster.
>I don't see any relevant velocity difference between 7 Remmy and 7 WSM. I do agree that either of these will shoot 180g VLD 50 fps or so faster than the 7 SAUM. If this is important to you, you know what to do.
Here's some more info on the WSM and SAUM. The differances are less than you think. 7MM CARTRIDGE GUIDE
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Custom built 7mm SAUM
Remember with the straight 7 Rem mag. that you have a much longer cartridge, limiting overall length in a standard long action and you have a belt (if that matters).
7WSM or SAUM are much better case designs IMO and are a wash between the two. If I was re-chambering a barrel it would be in WSM for ease of finding brass. but thats just becasue I've always had a hard time finding brass other than the really common stuff.
If that wasnt the main consideration I would go SAUM. both really cool cases.