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What Bullet weight ?

7mm WSM Sierra data

120gr 2.795
130gr 2.825
140gr 2.800
150gr HPBT 2.825
150gr SBT 2.815
160gr SBT 2.795
175gr SBT 2.830

snip From Sierra
Utilizing a larger action to accommodate longer or heavier bullets would be counterproductive, and defeat the whole concept of a short magnum. Designed more around the 140 to 160 grain weights, the 7mm WSM fulfills its intended role superbly. Sierra offers at least six bullets within this weight range that should be suitable for all but our largest and toughest big game. Considering its similar capacity, the 7mm WSM is well adapted to powders normally associated with the 7mm Remington Magnum. Magnum primers should get the nod here to ensure proper ignition and best accuracy.
 
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