I would talk you out of the 7WSM just because of shooting cost, lets put it this way, you will be spending at least $1.00 every time you pull the trigger. (Berger 180's run $45 a box of 100, and with around 60+ grs of RE 22 or 25 powder.) On top of that the Winchester brass is not the best. If I was to do it again, I would do a custom chamber using 300 or 270 WSM brass, necked up to 7. AKA 7/300 WSM (The shoulder is set back a bit further, and has a longer neck, and no they are not interchangable.)
http://www.accurateshooter.com/guns-of-week/gunweek071/
The other problem with the 7WSM , is there is not much information out there on the round for bechrest use, and only a small few are ueing this thing for 1000 yard benchrest. So be prepared if you ask a Bullet maker like Berger, or Sierra for information for them to tell you that they have none, that majority of thier customers use this for hunting.
I would not have a 7WSM with out a break, and it will not affect accuracy in any way shape or form. IMO 30 inch barrel is WAY too long, I would stay around 26 to 27 inches. It is a very bad idea get all of your weight from the barrel, I would opt for a more ballanced rig buy adding weight to the stock as well.
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